EXS 24 Logic Sampler Users Group

Hi,
I want to make a basic drum setup, and have a few questions.
1: Is there a big difference (Ram/CPU) in using one sampler with four sounds vs. using four samplers with one sound each?
2: I basically want to have one sampler with bass-drum, one with snare, and so on. Should I have only one sound loaded in the sampler if I only use one sound in a song? Of course it would be neat to have tons of different drum-sounds to audition them fast, but I`m on a Mac9600 with 192 Ram, so...
3: Is there a good way to make a hi-hat set-up where a open HH-sound mutes the closed, and the next closed HH kills the open?
4: Does anybody have a G4 emulator for my 9600, that will turn it into a MP G4 with 1.000.000 Ram? Send it to me, now!!

Any help appreciated.

Tommy