How serious are you about playing paintball?
I upgraded my Vibe, but that was because it had a noid issue (it blew, leaked and wouldn't stop leaking) so I bought a blackheart. I also bought a Techt L7 bolt since it's one of the lightest (either the techt or the deadlywind hollowpoint, can't go wrong with either of them).
I got a CP on/off from my friend and a freak barrel (I have tons of freak inserts) from another friend.
I would not have spent money on those things if I had to buy them new. I would look in the B/S/T for used upgrades if you're going to get them.
But here is a question you need to ask yourself before you go out and spend a bunch of money:
"What is it that I don't like about my marker, that I need to upgrade it?"
I see so many people go out and buy upgrades and they aren't good at paintball. Make sure to spend your money on paint, before you waste it on upgrades. It's better to buy the paint and get better at paintball, then to have a gun shoot really great and you can't get kills with it because you don't know how to shoot it.