I believe normal racks will fit - but I'm not 100% sure.

I have the folding rack from BF (which is pricey). If you do intend to travel with the BF, though, it's the only one that will fit in the suitcase. There really is no way to get the non-folding one in the suitcase with the bike.

As far as front and back - if you are carrying a full load, I agree with Emily that balancing front and back is a good idea. But - if you're only carrying a few things at a time (~10 lbs or less), I've not noticed a handling problem (and I don't have a front rack at all).