This is a great time to reiterate that startups receive Microsoft's software for free, obviously including all versions of Visual Studio.
Check out BizSpark.com or get in touch with me if you happen to be a YC company (felix.rieseberg@microsoft.com).
(Also, sorry for popping up in all the threads - We have a lot of threads here right now about VS options and I want to make sure that people know that they might be able to get VS Ultimate for free.)