Don't upgrade it at all leave it as it is and buy lots and lots of paint and play as much as you can as often as you can this will help you out a lot more than a shiny bling gat
OK in my humble opinion. Q-lock... had a friend who uses an eggy... it donnat fit captain! asa is then also a ness. now the ions ive used have all had dodgey regs and nackered eyes. but apart from those too and possibly a new reg (recomend eclipse star regs... look the biz) nothing is essential. its all about you after the Q-lock and On/Off.