here, I took the time to get some information for you from various websites... all these comments come from other rappers:
musiciansfriend.com reviews for the V63M:
"I purchased this mic about 2 weeks ago. It has work perfect. Has a nice low end sond to it especially when it warms up. Although It does has a little hiss to it(which might be the XLR cable) its nonthing that a little noise reduction cant fix. This is my first condenser mic but it works way better than the DYNAMIC mic I was recording on. VERY MUCH WORTH THE ***$"
"I was skeptical at first about purchasing this product because of the price. This mic was a great investment. Anyone who is serious about their recording but does not have alot of money to spend then they definatley need to pic this up. My sound quality improved 100% and I still had a little money left to buy some accessories. I own two now and I think I will purchase two more."
"I work with hip hop vocals mainly and if that is what you intend to do with this mic you cant go wrong. This mic is a powerful tool for home studios or beginners who might be on a budget. Check out some of it's work at my website."
"This microphone is very good for home recording. It has great quality and is well worth the price."
There were plenty more, but I wont add them all...
Comments on the V67G:
"marshall mxl v67g sounds surprisingly good for hip-hop. A friend of mine uses it on rap vocals and it sound classy."
again, I could keep going, but I wont.... honestly though, if you are just a beginner to recording, I'd be willing to bet you wouldnt tell the difference between any $100-$200 mic... it takes a long time to train your ears...