I personally have the Prokit on my 1g with AGX shocks, and l love it. My GF has a Prokit and Tokico Illuminas, It's very nice but still a little soft. I think poly sway bushings will help that.
I've never run coilovers but I've heard they can be very nice. You get the handling plus a fairly nice ride. Mine (1g) is kind of stiff and wished it had a bit more float. 2g can maintain a nice ride with the Prokit/Tokico setup. There's a price difference too!
I got both sets of Prokit springs off of E-bay at a good price. I believe I even bought both sets of shock off E-bay too. Ran around $500-550 for either set, with the 2g being the more expensive.
I always say that the 1g isn't as nimble but the suspension is strong, but is the opposite with the 2g's. They have more nimble handling but they're prone to suspension problems. Those double wishbones are just like a chicken's wishbone, eventally one side is going to give.