I'm no expert in Krav Maga (I only did one weekend seminar about five years ago), but I'd say that Judo and BJJ would work great with Krav. As a matter of fact, Judo and BJJ are great additions to anything!
A good friend of mind has been taking 'Commando Krav Maga' for sometime now, and he is a judo BB and studies BJJ. He seems to think they fit together well. I know Moni Aizak (s.p.) the creator of CKM helped train Carlos Newton for groundfighting, and Aizak has a dan rank in Judo. So, I think you would have a leg up on most.
As for Krav Milwakee? I can't help you there. You're best bet is to go check it out and ask them to give you a week trial. I think you need at LEAST that before you make anykind of commitment.
"Seek not to follow in the footsteps of the men of old; seek what they sought."