Re:
I've been running 8speed HG41s for a few years now doing heavy duty long distance commuting. The cassette is a 34-11 teamed with a single Surly SS ring up front (either a 46T or 50T, depending on time of year/type of conditions/choice of tyres with 9speed SRAM chain.
The 1x8 seems to give me all the gearing I need and it suits the optimum chainline the old frame allows. I'm still using my '92 Deore 7speed thumbies, which I can set to friction for 8speed or index for old style 7speed cassette (currently CS-HG20).
I was running a DX rear mech until it imploded over the road. Since then, for the last 6 years, I've been through two modern XT m772 rear mechs with the above drivetrain/gearing set ups. The m772s are easy to set up, robust and reliable – it's just that I get through them quickly because of high everyday mileage commuting. Kept clean and maintained regularly, the combinations have run sweet and reliably. There's a lot you can get away with, set up wise.
There is also the option to create your own cassette by deconstructing a couple of different cassettes in order to build your own custom range – something I'm going to have a crack at soon, having seen others.