Nothing personal... just working all day.
I'm a huge fan of 5100. Mixing in a little perique might be interesting. I don't have a lot of blending experience but I'd probably start with only 5% or so perique. Like Mark said, it's easier to add more than to take some away.
McClelland's Classic Virginia... adding two similar but different Virginias might be interesting, but I'm afraid you might lose the perique. Personally I'd try two mixes at first; a VaPer using 5100 and perique, and a Virginia blend with 5100 and Classic Virginia.
PS Cube Cut Burley... sorry, but I can't stand this stuff. Mixing it equally with 5100 would, in my opinion, negate the fine qualities of the 5100.
5100 and Half & Half... to me it's like mixing champagne and Busch beer.
You wanted opinions, you got mine.