Ok, I've decided I bneed to have a unit with a built in speaker and mic. Now after some research I came across three models from Sony that have this. One is a clearly obsolete model without MDLP. However there are two, both still avvailble bnew on eBay that I need to figur out whoich is better. The MZ-B100 is more expensive but the MZ-B10 is newr. But which is better. Thanks,