I don't see how the budget make any difference. "24" and "House" are probably a few million dollars an episode and they are moving to 5D Mark II cameras.
Of course budget makes a difference. Those cameras are still not primary cameras, either.
Again, why would you set out to cripple your product when it must be weighed against thousands that are probably equally hungry for the spotlight? Just to "save" a few dollars on the front end?
You're going to pay for it on the backend and on set/location, anyway...
If it's below 60K then you have to do what you have to do...