The SM7 (which I have sitting next to me at this moment) is good for screamers and good in noisy environments. It has a slow, heavy diaphragm that misses a lot of details, but also doesn't exacerbate room noise. That slow, heavy diaphragm also makes for a high SPL rating, so you can shout into it without it distorting. It does well in radio production rooms, but just doesn't cut it for VO. In a similar price range, the AT4040, Rode NT1000, Blue Baby Bottle, Rode NT1-A, SE2200A, Studio Projects C1, and AKG 214 are all going to provide truer, more detailed and present audio. Additionally, the SM7 needs 60dB+ to function well at all, which means an investment in a solid pre (a good idea anyway).