Hi Geoff,
I would suggest staying away from brand new instruments in that price range, it's just too much of a gamble. You don't know what the bass is going to sound like in a few years once it's settled down. Bryants that I've played have really impressed me for the money but I'd want one that had been played in. Take a trip down to Malcolm Healy's in Sutton and Thwaites in Watford to see what they have in. Also keep checking the adverts on [url="http://www.musicalchairs.info/double-bass/sales"]http://www.musicalchairs.info/double-bass/sales[/url], there's always some nice instruments on there and sometimes on [url="http://www.musicalinstrumentsales.co.uk/dbassales.html"]http://www.musicalinstrumentsales.co.uk/dbassales.html[/url] too.
There are also a few organisations out there dedicated to helping starting out musos purchase instruments and if you're lucky, they could sort you out with an interest free loan or similar. Then buying a ten grand bass that will last you your whole career may be possible. Just a thought.
Main thing is take your time choosing. If you like really like one, take it away on trial, play gigs with it, have your mates and teachers play it to you, play in different acoustics etc. Just be sure its right for you.
Good luck with the search