I also use a WW MF to dry but one of the towels on my "to buy list" is the extremely large water devourer from danase Extremely Large Water Devourer I've heard nothing but good things about it and just needing one to do most vehicles.
IMHO, the best WW's for drying are the ultra soft WW's that several on-line vendors sell. I could list at least 5 sources for the same towel but the best price right now is at Autopia while the Blue Perl is on sale for $6.25:
This is the same great ultra soft WW fabric with a satin border that is by far my favorite drying towel, and at that sale price you'd better hurry and buy a few if you don't have any.
My second choice would be the extremely large water devourer that TSIBrian mentioned. These are very BIG, very plush, and great if you like to blot dry.