Ok. I'll chime in here since no one else has yet. I think your gear choices are fine. I would personally go with the KRKs and the Mbox mini but that's just me. I'm sure someone will chime in against Digidesign soon but personally, it's pretty good bang for the buck. Just make sure you check your system compatibility before you commit.

http://www.digidesign.com/index.cfm?navid=3&langid=100&eid=3035

The mic is fine but it really depends on your voice. You might consider also the Shure SM7B or Electrovoice RE20 or even a standard SM58. If you've used the 4040 before and are familiar with it, stick to what works.

I couldn't say it any better than hueseph has said it.

Monkey hear. Monkey do.
Ms. Remy Ann David

I have the M-Audio Bx5a's and they are a little lite in the low-end. I had to supplement the bass with a home stereo to help this. Other wise they are great.