qeuestion for macbook people!

[Ben]

I am in the process of replacing my ageing and massive (17 in fujitsu) laptop and I want to go the mac route for numerous reasons that are unimportant to this thread. However I need/want portable so I am wanting a 13.3" macbook with a Apple 24" cinema display for home. The specs are 2.4Ghz processor 4 gig ram and 320 gig HD. After lots of google searching I am still a bit nervous. According to the system requirements of both CS4 and lightroom I should be ok, but I just need some clarification So here are my questions:

1. Will that be sufficient to comfortably run CS4 and Lightroom with D300 or equivalent RAW files (can be upto 27mb each)? I'm not wanting to win a speed contest, just don't want to get frustrated waiting whilst processing photos. There are so many varying and contradicting reports all over the net

2. Can the macbook with it's 256mb shared 9400m GPU run the 24" cinema display at max resolution (1920x1200). Sorry if that's a dumb question, but I can't find a concise answer anywhere.

Any help to settle my nerves would be great!

Cheers, Ben.