Definetly go combo, as it's still unclear as to which format (if either!) will eventually triumph. If memory serves (and it better, or I won't bother keeping the b*tch around), + and - are backed by opposing giant monolithic corporate structures, including, but not limited to, Sony, Microsoft, and the people who own that nifty DVD logo. None of the above are known for backing down - expect industry indecision to persist.