First off, paintball is the other half of my life, besides videogames.
As a starter, i would recommend a Spyder Imagine, or a Tippmann 98 Custom. For speedball get the former, woodsball the latter. They will both work for either, but that just a recommendation.
For 100, you wont get much, especially a complete package. (mask, hopper, etc)
Check out pbreview.com for great forums, and you can find nice used stuff in the trading forums.
PBgear.com is probably the best online paintball store, with the most competitive prices.