Most 5 string basses on the market have a useless 5th string, at best it sounds like a slow wet fart. I'm not saying there are not good 5 strings out there but i havnt seen one for that kind of money.
A decent 5 string bass would be a Warwick, but you're looking at 600ish aint ya?
Anyway, must say I'm a big fan of fender PBasses, I bought a chinese Squier PBass, it shouldnt have played so well if some people on the web were to be beleived at the time. It turned out to be great, still gets used, I paid Tim to make me a decent pickup though as the stock one is cr@p.
Cost me £150, the shop even threw in an amp for free as it was something they couldnt shift! 8) :lol:
If you want to look at the Squiers, or Mex/Jap Fenders, I'd suggest a really hands on play in a good shop, possibly taking a more experienced bassist with you if you know someone. One squier may be different to another in terms of quality control, so its worth it, you may even find a bargain.