How Can I Improve My Nets Team?

What are some good trades or free agents i can sign to improve my dynasty New Jersey Nets team? Please help.
I have the latest Live 08 roster update and this is what the team looks like at the moment. I have -1.47m cap room.

Starters
C S. Swift 70
PF Y. Jianlian 73
SF B. Simmons 73
SG V. Carter 88
PG D. Harris 79

Bench
M. Williams 72
T. Hassel 67
D. Armstrong 69
S. Williams 66
J. Graham 69
B. Nachbar 65
D. Mason 72
J. Boone 59 (<<< I really want to get rid of this guy)
D. Diop 68

Things done since dynasty start:
Singned J. Williams
Traded N. Kristic, M. Ager -> Raptors J. Graham
Signed T. Kinsey
Traded J. Williams, T. Kinsey, R. Jefferson -> Bucks B. Simmons, Y. Jianlian and D. Mason

I don't have the roster updates cuz i use 07 but i'll do the best i can to help you but, maybe you can trade swift and armstrong for either kaman or beidrans. If i knew the salaries of these players i could help you more. But i think that you should get rid of swift because he's getting older and he's going to decline pretty soon. Maybe you could add a young player in the mix and along with thosetwo players i mentioned and get yourself a draft pick, maybe a 1st rounder? How does that sound? Then you can draft a center, because i think that you really need a better starting center.

Thanks for your reply, that sounds like a good idea, Swift isn't that good really I didn't look at their ratings but Diop seems to be able to rebound and score easier even though all his "hot-spots" are cold/blue. I might try and get Bogut, I would like Dwight Howard but I have to think realistically what I can get for what I have, I'll try tradin Swift with Hassel, Armstrong and maybe Boone.