step off the $ treadmill
Plus, if you are growing weary of buying 3.5e bound supplements that cost $35 (races of stone, complete arcane, masters of the wild, unearthed arcana) and come out every three months plus a complete new edition version costing $120+ (1e-2e-3e-3.5e-4.0) every four years, buy c&c once. I plan on playing the base c&c rules mildly ammended over time for at least the next decade. All I need now are an occasional $5-10 modules from goodman games or troll lords, old d&d modules from ebay, dungeon magazine or troll lords crusader magazine. Again, I can use any source for my c&c modules as for the most part', all editions port into c&c pretty well and could almost be done on the fly. If I want to borrow something from 3.0 or 3.5 via home rule, I have more feats and prestige classes than I could ever use.
For the 'most part above', means youd probably have to be careful about higher level 3.5e modules, as well as modules with dragons, high level wizards, giants, fiends, etc. as they might need to be toned down considerably to fit C&C. In other words, sunless citadel, forge of fury, and the S, L, G, and D series from 1e could all come over directly, but return to temple of elemental evil would probably need pc levels 1-2 levels above those in the 3e version as well as reducing/eliminating perhaps a quarter of the really powerful BBEGs.