I reckon you're gonna need to try before you buy as well.
I've not tried the Squiers, but I've heard of folk who love them.
One thing I could possibly add: I think I'd head for a Jazz rather than a Precision. I use a Variax bass, which feels a bit like a Precision to handle, but obviously it's got a whole bunch of "basses" inside. Out of all the models on board, it seems that the most flexible sounding bass for me is the Jazz, closely followed by Rickenbacker (mebbe). A Precision does a nice ploddy thump, very well, but not much else as far as I can tell. The Jazz does that plod, and it growls and bounces and does a whole load of other stuff as well.
Other models do other stuff better, but for a blues/rock bass, that can do pop/country etc as well (I'm sure it can funk too, just not in my hands!) - I think I'd choose a Jazz if I was only getting one bass.
I've never actually played a Jazz, but I also understand the neck is less of a culture-shock for us 6-stringers when we first try to play the, er, "easier" instrument :lol:
EDIT: Ah... you posted while I was musing... :D