Android & ROM/RAM sizes

[V4NT0M]

So it looks like I'll be selling my G1 and getting a Samsung Galaxy Portal in the next week or so, sick of the creaky & fat G1. I've been looking at a lot of phones and many of them seem to have different ROM/RAM sizes and of course I know what they are but not really how they are used by droid...

Can anyone enlighten me as to what exactly ROM and RAM mean to android and how they would affect my decision to by a phone?

 

[V4NT0M]

That's what I gathered, I think the problem was that "ROM isn't ROM" thing.

So basically with more ROM I can install more apps and the more RAM the faster the device should run.