I usually use European beech, same as Festool. I payed $2.60 a bf for 85 bf of 4/4 on Friday. I'm always using beech so there's always some lying around. I highly recommend the stuff. It's strong, machines and glues well, takes stain as well and evenly as anything I've used. It has a very nice natural color with just poly.
The only down side is that I often get boards with quite a bit of spring. If I'm using it for doors I pretty much have to rip it to rough size and let it sit for a couple of days before final milling. And on the boards that do have spring I get some burning during ripping. I'll sometimes get some pretty wicked curves and bows on long narrow face frame parts for pantries and refig surrounds. On the plus side, very little twist (which is the worst thing to me) and almost no cupping.