A 2.2L NA Goblin is quick. The 2.0L SC and TC variants are quicker.
Early 2.2's (early meaning, 05 and 06 ... I don't think 07 is considered an early model) cannot be tuned. Later 2.2's, all 2.0's, and (I THINK) all 2.4's can be tuned. All this means is, if you pick up an early 2.2, you won't be able to add a supercharger or turbocharger later. If tweaking/upgrading will be a thing for you, then make sure you avoid early 2.2's.
2.0 supercharged donors and 2.4 NA donors I believe come with the strongest engines from the factory. 2.0 turbo donors are next in line for strongest engines, and everything else comes after those. Regardless of what engine your donor has, you'll need to build the engine a bit with stronger rods, pistons, etc if you want to make REAL power. This is not my area of expertise, so I'll cut it off there.
2.2's are everywhere, and are a dime a dozen, especially if you buy a wrecked one from Copart/IAAI. 2.0 SC and TC donors are getting quite scarce. I got lucky and paid $1700 for my totaled 2008 SS/TC with 78k miles, which started and ran. Since it was smashed in the front driver's side and was immobile, I needed to source new front suspension bits while building the Goblin.
Hope these tidbits help you some.