For Wee Heavy I've variously used (Wyeast numbers here for reference but have used White counterparts as well) 1968, 1728, 1098, 1099, 1056, and my house yeast (exact pedigree unknown).
Any one of them is a great choice and every one of them has made really great Wee Heavy for me.
Oddly, 1728 was my least favorite. As I said, all were great...but the two most extraordinary ones (in my opinion and the opinion of most who tasted them) were made with 1056 and 1099.
As always, your results may vary.