I have a WeeStrom, as well as R1200GS and a DL1000. They are all great bikes!
I really like the new F800GS, and I think the new F650 is pretty close.
I am guessing the real world price differenctial is huge. i.e. you will likely pay full retail for the new Beemer, whereas the Wee can be found (out the door) for $6500 or so (maybe a bit higher with ABS).
Is the Beemer worth the difference?
You'll get all kinds of opinions, but it's your money, you decide.
I think you would be pretty darn pleased with either bike.
2011 Victory Cross Country
2005 Suzuki Burgman
2007 Dyna, 1947 45
2007 VStrom, DL1000
1975 BMW R75/6,1981 BSA Lighning