Does Cineform (or users) recommend any optimisations of WinXP and Premiere in particular for Aspect/Prospect?

For example,
1) Does Vista offer any advantage? eg more system ram...

2) Should Premiere be fine on "optimise for performance" setting or will "optimse for memory" still be required ?

3) On SATA raid do you recommend write-back-caching on?

4) Has there been anytesting on SP3 for XP as yet?

Thankyou