ANY cable if fine with Digital Signals, such as HDMI, SPDIF (optical/coaxle 5.1 cable) DMI, etc.) So find the cheapest ones you can find. DONT worry about gold connectors with Digital Signals, just make sure you stay under the specified length set by the standard (which is large). I need to research DMI and HDMI max spec length.
Nothing good comes out of Monster (unless you find supersales). Anyways, If you care, buy a cable that looks good and that also is flexible, good strong build quality... Outside that, dont worry. Bluejean cables look good. I like that you can order them to the exact length you need them to be. If you cant build your own cables, then this is awsome.
Speaker Cable should be from HomeDepot or a Electronic's store... I recommend the RadioShack brand thick speaker Cable. I think its reasonable price. It looks great, and I think its a good price, though I havent researched it...
Speaker wire, I like 12 or 14 Gaudge cause they fit my connects the best. I would recommend 14->16 gaudge for thoose who dont have my special needs. Of course copper. Any stranded wire will do.
Mike