Congrats on saving up - May/June will be here before you know it.
I'm having the same dilemma as your friend, babyvamps. With the clothes that I already owned, I filled out my tops really well but now 6 mo on I think I really need to go shopping! The tops that I used to wear when flat chested (flowy, soft, not fitted) now make me feel like I'm with child!
I'd wait to go shopping until post boobies.
You can reward yourself with a new wardrobe that best compliments your new assets