It depends what kind of packs you are looking for. Stick packs with fit in most newer RTR's, but the pro level Sedans only take the side-by-side packs. I'm pretty sure that Trinity makes pre-assembled stick packs and side-by-side's, but I think SMC does too. There has gotta' be hundreds of reputable matchers out there that make good packs, but it all depend on how many you want, what you need them for (competitive racing, bashing, etc.), and how much you want to spend.
Xray T2 '007
Novak GTB 13.5/17.5 Brushless