If someone criticizes you on a dumb question on here, ignore them as they are know it all's, not that there is any one here or anything lol. The best thing to do with the Big 3 as mentioned above, is think about what you are going to do to the quad. Such as, will you go into the engine for more mods? If so, then a Dobek probably isn't for you. If not, then a lot of people enjoy their EHS setup. If so, a PC3 or 5 is your best bet, as you can go to any authorized Dyno tester and they will be able to fine tune your set up. A big recommendation of mine is to do tires first, and then go from there. Some people save up and buy one thing at a time, and if you are to do the big three, and buy one thing at a time, the best thing to do is get the programmer first, as that is the limiting factor as Roadkill said when purchasing a full exhaust. Another thing people say is to get a sway bar or better shocks.
2008 700xx; Power Bomb header with power core 4 exhaust, Power Programmer III, pro armor nerfs, prm products control front and rear bumpers and full skid, 10" ITP rears, ITP Baja's fronts, RZR 2's all the way around, Uni filter, 13t sprocket, CCP steering Damper, DS450 shock swap, Dual Gasser Throttle, bar risers and Moose barkBusters. 730XX kit plus other engine mods!