Sorry. Already traded Guilty Party for a 3DS game.
I'd probably do this trade:
Your:
Dreamcast System
2 Controllers (1 Official, 1 3rd Party)
1 VMU (Official)
1 Memory Unit (3rd Party)
MY:
Blur
Dreamcast Collection (360)
And, I wouldn't have to sell the DC games I have on my list now. That's what I get for buying the games BEFORE the system.