I'd keep both consoles as that then keeps you open to a wide range of options in the future when deciding to purchase games. Also I have a question if you hate space-related games then why are you thinking about getting Halo:Reach? I then have to ask the question why do you own a PS3 when a majority of the good FPS are space/futuristic-space styled (e.g.Resistance 1 and 2, Killzone, etc)? In addition I suggest if you like general shooting get a crackdown (lol) game for the xbox 360 or RDR which isn't really a shooter but is very good.