> Does anyone know of a good low-cost commercial programmer that can program all of the Pics?

Unfortunately your use of the two words "low cost" excludes giving any sensible answers... all the programmers I can recommend omit that from their feature list.

However, given the fact that you have some success with your PICs leads me to suspect that there is something 'marginal' in your setup. I don't know your programmer at all, but I would suggest in the first instance you put a scope on your PSU and ensure you have a constant and steady DC supply. Check the programming pin MCLR on the PIC... you should have some 13.5v on it (unless you're using Low Voltage Programming) - if this varies or drops it will cause the PIC not to program correctly. Plug-in a PIC, hit 'program' and make with the multimeter or scope...