I'd probably go with that mic also... I had a Beyer m58 and you had to get it RIGHT in someone's face to get adequate volume. (which can be a good thing at times) Then a friend convinced me to go with an AKG d230... and that IS a good sounding interview mic... but it didn't mate as well with my Lectro as the Beyer did... and the AKG is a little too open sounding. I actually get MORE information in an interview then I want...
Since you always see the re50 and it's often part of a plug-on wireless, I'm guessing that it does mate really well with a plug-on... and since it is the standard I'd say go with it. It's not always the case, but many times there's a good reason why everybody uses what everybody uses.
Most news crews do use the RE50B, but if you have big hands, you might want to consider using a mike with a longer handle, like Sennheiser MD46. When you attach the RE50B to a wireless transmitter, there isn't much room to hold the mike by the handle. So a lot of people hold it by the transmitter, which just doesn't look good to me.
MD46 is cardioid (versus omni for RE50B) which may be good or bad depending on your situation.
B&H is a good source. You might also want to try TAI Audio ( www.TAIaudio.com ). They're local to me (Orlando), but they sell and rent equipment to productions nationwide. They're very knowledgeable and have good service. And many times, their prices are lower than B&H!