I recently purchased a Saga MB10 5 String Bass Kit, and I'm looking to keep the bare wood look rather than paint the body. I've checked out the hardware store and I've found a nice natural varnish, but I'm stuck on the clear coat. Should I use one, or not?

If I do use one, what is the best bang for my buck? I know certain Polyurethane products can yellow the wood, and I'm trying to avoid that! Any suggestions are appreciated, thanks!