Also, if you're looking to play Rockabilly, you'll probably want lower tension strings than the standard medium gauge steels that come with most basses. LOTS of options there. The original Rockabilly guys all used gut strings (well, that was all there was) and the real classic sound comes from that kind of string. But they're also temperamental, difficult to keep in tune and maintain, and break sometimes when you don't expect them to. If you're starting out, weedwhacker strings are a good cheap option...they're actually made from weedwhacker line, but they sound fairly close to gut and are pretty cheap on ebay (or if you figure out the right gauges, at the hardware store!). You might be unhappy with the low E string on whackers though...they're kind of quiet...lots of discussion on other substitutes for this (and lots of good information and opinions) can be found in the Strings section of the DBC forum at
dbc Double Bass Forum, Upright Bass Chat - Powered by vBulletin if you're interested...it's a great forum with lots of info for Rockabilly and Roots players. Other good string choices are Innovation Silver Slaps, Innovation Rockabilly Strings, Eurosonic Ultra lights, and Cordes Lambert Strings.