Starter Setup

What Up.
I'm new to the MPC game but a little bit experienced with my all digital/software setup.

I have the following setup, and I'm wondering what type of mixer is the most/versatile for my setup.

MPC 60 II (Original OS, No SCSI)
Reason 3.0
Recycle
Audacity
FL Studio 7
M Audio MobilePre USB Interface
M audio Trigger Finger
M Audio O2 COntroller
Basses and Guitars
A decent Audio Tecnica mic (forget the model number)

Needs:
1. I need to be able to sample audio coming from my PC into the MPC
2. I would like to be able to mix what comes out of the MPC into something like FL Studio/Reason/Cubase

So my questions are:
Which mixer? What's the price range where your quality starts to drop off?
Will an analog mixer actually yield a warmer sound if I'm mixing back into my PC?
Can I use the M-Audio MobilePre USB for anything at all (in regards to the MPC)?

Appreciate your patience with my toy status. I can freak the Reason pretty well though so if anyone wants to talk shop about that I'm down.

Thanks again.