www.countypaintball.com has the new model PGPs for $80 dollars.
The PGP is pretty much THE best pistol for paintball out there. Sure, there are semi guns like the PTs, but those are made in Taiwan, not to mention they have issues getting up to a playable velocity, and even when up there you will be unlikely to get any decent shots per 12 gram at that velocity.
Then keep in mind there are 10 rounds on gun, before you ahve to reload. You want to make those 10 shots COUNT! With a semi you will be more inclined to shoot them off quickly (which also reduces shot count per 12 gram), with teh PGP, you will be more willing to take good shots, not stupid ones.
On a decently warm day (60 degrees and up) I get at least 25 GOOD shots (270 fps or so, best velocity when using 12 grams), and could stretch it to 30 shots if I felt like it. Usually I just change at 20 so I don't have to compensate for reducing velocity. With the semi pistol you will be lucky to get 10 good shots, 20 maximum. This shot count goes down if you shoot fast, and forget about using it down to 40 degrees.
Not to mention that if you really do want a semi pistol, you can have the PGP customized to an autococking gun later on, which will be a much better performer than the blowback PT type pistols.
if you want more info on the pgps, check out www.pgpog.org or www.pumpplayers.com
I use mine as a main gun when going against electros, when I'm in the mood, and manage to hold my own.