A Vince Carter deal would likely revolve around Wally and at least a first. New Jersey, given Rod Thorn's past deals, will drive a VERY hard bargain, probably opening the discussions at Wally, JJ, and 2 firsts. This might make it difficult to get a deal done, regardless of Vince's impact on this team, because we will not pay that much for him. Wally, a first, and a minor asset (Sasha, Darnell, Sasha Kaun, or a 2nd round pick) would be the max we'd be willing to pay.
As for Vince's fit on this team, he'd start at SG, which would make our guards off the bench Delonte and Boobie. Personally, I don't think you'll find many backcourts that are this good off the bench. If we get to keep Sasha, we'd have our long athletic defensive 2/3 and we'd be set in the backcourt for the next couple of seasons. Vince has a terrific outside shot, and still has the ability to get to the basket, whether it's by beating his man off the dribble, or making a backdoor cut for Devin Harris (or in this case, Mo or LeBron) to hit him for an easy bucket. Vince's defense isn't that bad either.
Unfortunately, there are some concerns with Vince. The first is his age and contract. He's 32 years old and this is his eleventh year in the league. You'd have to assume that his age will soon stop him from being an elite scorer in this league. His contract is guaranteed through 2010-2011, with 2011-2012 as an unguaranteed year. His salary will stop us from having any room under the salary cap in the 2010 offseason (assuming LBJ stays), and keep us to our familiar MLE and BAE. Also, Vince's attitude is something that is a minor issue, according to Toronto fans. However, it seems that as long as the team is winning, Vince's attitude doesn't prove to be an issue.
So, with Vince, he does sure up your backcourt for this year and the next. However, he ruins any 2010 cap space plans. Personally, I would stay away from him because I feel that our front court is more of an issue. However, if you feel that a shooting guard is more important at this time, and you care about winning over the next two years as opposed to getting young talent that can help you win past 2010, VC is arguably the best option out there.