Should i get an xbox?

should i get an xbox i have a ps3 and wii but im not sure can anybody reassure me i want to get a new xbox 4gb and halo reach and 12 month xbl that comes up to about �180 should i or not dont say stuff like "sell your ps3 cos ps3 sucks " ok i want help on this :) also will 4gb be enough ? can i buy additional hard drives,whats the cheapest way to get xbl i dont want thoose oh www.freexboxlive.com i want to get it legally thx and is it worth it