Hey all,
i'm new to the world of certificates, but i just got confirmation from my boss that i can follow as many microsoft certificates as i want to do

I'm thinking of starting with the MCITP w2008: SA and continue from there on.
I'm planning on using the guide from CBT Nuggets, got the microsoft press MCTS Self-Paced Training Kit for my exams and the cybex books comming my way this week.

Basically i'm looking for advice on what client OS to use for my labbing.

Windows XP or Windows 7.
Also how much time did you guys spend learning all of the courses for the MCITP w2008 SA certificate?
Kind regards,
Pirader