In case you haven't heard (or haven't read my blog!) there is a 30% promotion available to step up from Visual Studio Professional to one of the Team Editions or from a Team Edition to Team Suite. This offer is valid until June 30th 2009, so you still have time to think about it 🙂
For more information about the promotion check out the details here.
Keep in mind VSTS 2010 (formerly known as Rosario) is only a few months away and this offer (in conjunction with a valid MSDN subscription) is by far the cheapest way to get your hands on this fantastic release. Check out here of what's coming in VSTS 2010.