Need help building poker laptop

[MarkL444]

So im going to be getting a dell laptop soon and needed help building it. Primarily, Im curious how fast of a processor I need. Right now I have a desktop with a Pentium 4 /ht tech 3.0 ghz. These laptops all come with Pentium M. If I had a Penitum M 1.6 ghz would I notice a significant decrease in speed?

I use my computer for a few things:
-Poker. (pokertracker, HU displays, multiple skins, etc)
-World of Warcraft
-Playing movies, tv shows and stuff
-General internet email stuff

In general would a Intel® Pentium® M Processor 730 (1.60 GHz/2MB Cache/533MHz FSB) w/ a gig of ram and ample HD space be enough for that. Anybody using one of these having any troubles?

Also with RAM. I have the following options...do I want to knock it down to 256 and buy some RAM myself?
256MB DDR2 SDRAM at 533MHz 1 Dimm [subtract $75]
512MB Dual Channel DDR2 SDRAM at 533MHz 2 Dimm [Current Setting]
1GB Dual Channel DDR2 SDRAM at 533MHz 2 Dimm [add $175]
2GB Dual Channel DDR2 SDRAM at 533MHz 2 Dimm [add $675]

Thanks