Replacing an old cassette

After a bit of advice. I'm doing a full strip down/refurb of my 1999 Specialized Rockhopper and I'm looking to replace the cassette, BB, front chainset, chain and various other bits. I'm just a bit stuck with the cassette. Currently the one on the bike is marked "Shimano CS-HG70-9 11T".
I've been looking at Sheldon Brown but TBH I'm not 100% sure about what I need. If I'm reading it correctly, I think that I can use pretty much any HG 9 speed cassette but does anyone know for sure?
I'm thinking this: http://www.wiggle.co.uk/shimano-cs-hg50-9-speed-cassette/
Any cassette gurus out there?
I've been looking at Sheldon Brown but TBH I'm not 100% sure about what I need. If I'm reading it correctly, I think that I can use pretty much any HG 9 speed cassette but does anyone know for sure?
I'm thinking this: http://www.wiggle.co.uk/shimano-cs-hg50-9-speed-cassette/
Any cassette gurus out there?
2013 Felt F85 in white
1999 Specialized Rockhopper A1FS in Orange (winter commuter)
1980s Raleigh Kellog's Pro Tour Reynolds 501 (trainer)
1999 Specialized Rockhopper A1FS in Orange (winter commuter)
1980s Raleigh Kellog's Pro Tour Reynolds 501 (trainer)
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http://www.chainreactioncycles.com/shim ... -prod27680
1999 Specialized Rockhopper A1FS in Orange (winter commuter)
1980s Raleigh Kellog's Pro Tour Reynolds 501 (trainer)
Also look at the HG61 - about 18 quid if you're looking to save and not so much of a lump as the normal Deore.