i have a 5600 C4, i'd recommend it. i believe it has 4 ball bearings, and a 6.3:1 gear ratio

personally, i'd like to get an older 5500 or 6500 off of ebay, something like a late 60's to early 70's one with flat sides and dual brakes(looks like a modern 7000 c3). my dad has one and he's used it for well over 20 years, and it never lets him down