[QUOTE=late]I like the looks of Sheldon's CS925 cassette
http://sheldonbrown.com/harris/k7.html#9
I bought 2 cheap (sram and shimano) cassettes for $20 apiece (bargain bin). Drilled out the rivets, put together the cogs I wanted, put them on the freewheel (with spacers) and instant 13-34 or any other configuration I wanted. Took less than 1/2 hour. You can also buy individual cogs off the web cheaply enough to replace 2 or 3 cogs if you dont want to spring for a full cassette.
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'94 Schwinn Moab 3
'03 Giant OCR Touring
'06 Surly LHT
'01 Giant Yukon
I choose the way to go, but the road won't set me free