Yeah, a 2nd hand Bubinga Warwick Corvette could last you for years, but is heavy. Personally, I don't like the natural ash ones, they feel like Warwick couldn't be bothered to finish them properly.
Or just save up a little more and get a Corvette Doublebuck, fantasatic range of tones!
Let us all here on Basschat temp you to SPEND, SPEND, SPEND! Still, you could always economize by using cheap strings, I recommend Legacy from Stringsdirect, I think a 4-string set is about 7 quid.