I would say buy the cheapest that comes with the right number of cogs, I am currently using a SRAM PG 1070 cassette and PC 1071 PowerChain, could not comment on how I am finding it as it has been on the bike half a week and only done 50 indoor miles. The cassette looked a bit nicer than a Shimano one (as far as a spikey cone goes), if you are an appearance ponce like me.
I have previously used Shimano 9 spd tiagra and 10 spd 105, both were fine. The more you pay, you get a lighter cassette, that is about it. If you pay silly for DA it doesn't even last as long as a standard cassette because the larger cog's are a different material for weight saving and wear faster. The SRAM Red level cassette is pro though, machined from a single bilet! Lovely, no collapsing pile of cogs when swaping between bikes, also nice and light, but the price it outragious. I run SRAM Red as of this week, but opted for Force level cassette and chain for economy.