Having been involved in support in the Publishing / Graphics / Design industry for a time, my first question would be WHY would you want to run the entire CS3 suite at the same time??? The specific components, while complimentary are almost mutually exclusive as to the functions they perform (almost…).
To answer your question, you are going to need as much memory, hard drive space (most likely) and fastest processor you can afford. Kick the RAM up to 4GB (maximum it will handle) – you’ll probably want to have Apple install it for you as the 2,16GHz MacBook Pro is an older model either on closeout at Apple or being bought used. To run ALL of the programs, you’ll want a large display: I think the 2.16 was a 15″ screen (not sure though), so see if you can afford an external monitor (19″ MINIMUM, larger if possible).
The functions you will be performing are (as you know) quite demanding: I would seriously suggest using only one or two of the programs at a time if possible…
As far as a comparable PC, a Lenovo T61 can be had for USD 1250 (approx) configured with 4GB RAM and a faster Core2Duo processor (the T500 is limited to 3GB per Lenovo spec), and a Dell XPS M1530 around USD 1700 also reasonably equipped.
Personally, I’d stay with the Apple for CS3 use….