Check cabelas for their Advanced angler series. At least 1 60 in sock if not 2.
If you can stand it hold off and watch for their sales.lots of times you can get good deals on these.
http://www.cabelas.com/product/CABEL...ck%26CQ_st%3Db
You could also use chains. Get about 6 ft of 3/8 chain cut in 2ft sections. 2 pieces of 3/8 nylon rope 50 ft long. 4 caribinners big enough to hook 3 sections of chain on. Tie one to each end of rope. You can put one section on each rope and adjust speed by adjusting length of rope then if you need more just add another length of chain to hook until you get speed right.