Heheeeeee
Boy you asked the right question on the right forum at the right time. I have done a TON of research on this matter (far tooo much really).
GET THE PRO TS! My friend has a tricked out Tippmann (Brianguard16) and he's now switching over to the Piranha Pro TS. Go to PaintballgunReview.com and read the review they have for it. It's...well....
(awesome)
At PBGR.com you can also read reviews on the Tippmann and the EXT Pro. They are both good guns...the Pro TS is just...how else can I say it....better?
Also, at Pbreview.com (different site) the average rating is like 9.9/10 for around 40 reviews
The Piranha will be especially good if you are running c02 as they come stock with a decent regulator. They strip down like no other (very easy) and the Pro TS actually has a good stock barrel, so you don't have to upgrade that.
The only drawback I can see for you is that the Piranha and most guns come with either a powerfeed or a vertical feed which both block the middle of the gun so you can't really "see" down the middle. I've just learned to aim with the tip of my barrel.
-All of this is data I've collected from reviews, and I have no actual experience on the matter. However, I would STRONGLY advise the Piranha PRO TS as it just kicks major booty.
Dat's jus' my opinion, but I am always right and will never, ever be proved wrong. You see?