I would imagine so, yeah. Although I have no experience with editing on 4200 drives I don't think it would be worth it due to the performance hit. Get at least 5400.
Centrino's and regular p4's are really meant for different things. If you want the best performance for games and media editing stick with the p4's but, if you want better battery life and an all around more laptop like laptop then get...
Please read the rules. The first site is a reseller and the second is direct from Sager. So, yeah the first site is probably legit but most people here recommend you buy from www.pctorque.com.
Reinstall the drivers. The tv tuner is a pain to install if I remember right. Here is a post by Adam which goes through the driver installation process (on an 8886, but it should be the same) and it gets a little more tricky with the...