Haven't read any more than the first page so I'll offer you two years worth of home ownership advice that may have already been mentioned, if so, consider it reinforcement.
That power washer? Not a bad idea. It isn't a matter of keep the outside aesthetically pleasing, that dirt build up will cause rot in the boards and also makes it that much harder to see if you have insects and what not that are damaging your home. The first guy just didn't present his argument very well. I rented one the first year for about $80 or something like that. I was going to rent another one this year but then found one on Craigslist for $150. You may not want to pony up $150-300 on a washer right now (and probably won't need to until next summer anyway), but remember that all house stuff like this holds its value very well.
Get a decent set of tools. Home Depot (though from the vs. thread you may prefer Lowe's due to HD's CEO being a huge RNC donator) has sets that will fill many of your needs. I have this one
http://www.homedepot.com/Tools-Hard...splay?langId=-1&storeId=10051&catalogId=10053 and have been very happy with it.
Start reading about home maintainence and repair. Since you're a CAG, go to the library, but seriously home maintainence for dummies is worth its weight in gold. Also, if something happens (i.e. toilet leak) don't panic and think you need to buy a new whatever. Google can be very handy as well at times like this.
If you've got that big air exchanger outside of your house for the A/C, hose it down every couple of months and use a fridge coil brush to clean off any cottonwood and such that gets stuck on there. The 5 minutes it will take you to do this will save you MANY THOUSANDS of dollars instead of replacing the thing if it gets gummed up.
You may have to spring to have an HVAC professional come in and assess your situation if it's still too hot when you're sleeping. Also remember, hot air rises and cool air falls. When it's hot out, keep your upstairs vents closed and vice versa. This helps in recirculation and will help you keep costs down over the year.
I'm an animal lover and the thought of killing anything with fur turns my stomach. That said, if you get mice it's you against them because they will destroy things in your house. Woodpeckers? Get some cement based wood putty to fill the holes and then hang some peanut butter soot in a tree away from your house. Like, two blocks away. Raccoons? BB Gun. They're the

ing devil I tell you. Snakes? Glue traps, same for larger vermin of the vole/mole/rat variety.
Clean, heavily and often. Not just your entryway either. Be prepared to get dirty by mucking out your own sewer line instead of paying Roto-Rooter $300 to do it for you every couple of years. If you have carpet, vaccuum the hell out of it on a regular basis, especially if you have pets. Carpet is a bacterial paradise. Get a Dyson vaccuum, they cost more up front but you can fix 99% of anything that goes wrong with it by yourself (even if you're not terribly mechanically inclined) and you will spend $0 on filters and bags for as long as you have the thing. Get a shop vac too for any wet spills. I bought a mini wet/dry from Lowes for maybe $30. Brilliant purchase.
Have a lawn? Then you're gonna mow the

er. Might as well get a decent mower, unless it's really small and you can just get one of those mechanical push mowers. I have 1/3rd acre which is not much land, but my self propelled mower makes the whole ordeal last less than 45 minutes. Have trees? Then you have leaves, time to get a rake. Get two so you can do it with your lady.
After the first freeze, turn off the water to your exterior spigots (trace the line back to your house, but the valves are typically in the laundry room) and then cover said spigots to keep the creepy crawlies out of there as well as prevent freezing up the line.
It's like having a car. Keep your fluids topped off, regular oil changes, keep the tires close to full and don't set the thing on fire. Do all that and it'll last a long time and keep you happy.
If you have a dishwasher, check the drainage pipe every other month or so to make sure it isn't leaking (likely under your sink). Replacing all the wood under your sink because you didn't bother to bend over for twenty seconds every once in a while will make you feel like a major dumbass. Not cheap either.
Walk around your house and look at things fairly often. The first few times you do this, take a lot of notes and pictures. It'll make it a lot easier for you to notice if things are changing.