For the last couple of years I have got a SRAM PG 1050 cassette and SRAM 1051 chain and never had any issues.
Chain comes with powerlink, which I like to undo for cleaning the chain "properly" before putting back on nice and shiny (some people say you should never undo and redo a chain, but I have had no probs so far). A few gearing options on the cassette too...would imagine a man of your climbing ability Chris would go for the standard 12-23, and not the 11-32 like me

.
I usually find cheap online and then get from
Evans after asking them to price match (which they have done). Usually around £50 to £60 for cassette and chain, depending on offers at the time, which isn't too bad once a year (every Spring, after around 5,000 miles for me).
Good luck fella
