I stopped playing space marines a long time ago, what you have look's nice and you should be able to get a fair bit.
As to rules, 40K 4th is pretty easy to learn and play, you only need your own army codex and they are only £12-15 each, the rules are simple enough for 10 year old's to play (though they tend to cry when you beat them into the dirt on turn 3)
Warhammer is a good game as well, you need your own army book to play, and the rules are a bit diffrent from 40k, more mature in a way.. Less kiddy's play it, so you don't hjave to listen to crying as much..
Both are fun, worth going into a GW store and asking for a introduction game.
__________________
-Jenn
|