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I'd like to replace the chain on my bike and actually get a couple of new Ultegra chains and swap them every 100 miles or so. I've only ever used SRAM chains in the past so am used to a powerlink, can this be done with such a chain:
Super narrow lightweight 10-speed directional chain for optimum cassette and chainset interaction and maximum power transfer (recommended for use with double systems only).5.88 mm chain width optimised for 10-speed Super Narrow HG drivetrains
I couldn't see where I can get a powerlink for this?
You can, but the 10 speed SRAM links are Power Locks, not Power Links, they're designed to be single use. You can get them apart with the master-link pliers, but they're not designed to come apart.
KMC Missing Links are replaceable, and will fit fine in a Shimano chain, although I prefer KMC chains. Get X10SLs from Taiwan on eBay and they're generally £22 or so.
I've used a mavic chain as it was only £10 Vs ~£25 for shimano and came witha quick-link, although I'm not convinced it wasn't a false economy as when I swap wheels to the much less well used (summer) pair it skips on 13/12/11 sprockets. I've got a 10s KMC link (cheep for a pair of pairs from decathlon under their own brand) in a DA chain for those wheels now and it's fine even through the chain is supposedly directional (you'd have to be unlucky to shift at precicely the wrong moment and even then I doubt it's noticeable in the real world).