Looking at Jessops for some costs, here's what I'd recommend as a starter set:
• Manfrotto 055XPROB = £105
• Manfrotto 498RC2 = £87
• TOTAL =
£192
You might want to read
this article, which advises just getting the best from the start, and makes some good points. But take a rational approach (and keep in mind that the author just assumes you'll chuck the gear you don't want anymore into the bin, instead of selling it to recoup some of the loss).
One more suggestion - go into a shop and try some out. Manfrotto uses lever-locks for the legs, other brands use twist-locks. Play with the heads. See how easy it is to extend/collapse the legs. Find something that's comfortable for you to use.
Hope that helps...