Dude.... you dont want the regular 3ds... I was a day one buyer of the original and also traded it in on a day one 3DSXL. You'd be doing a disservice not shelling out the couple extra dollars.
I have to ask, why? The only answer I can think of is really price or size. FWIW I love my 3ds and XL - and didnt regret one second of either purchase, which is what prompted the XL purchase, the original 3ds was that good.
Also worth noting - is the fire emblem bundle that is out (if you can find it in stock). It might be a little more money, but you get a great game, and a ltd. edition (sort of...) blue FE/3DS.
Let us know where you end up getting your handheld, and what kind of package/deal you might get!! good luck!
-Al