I'm looking at about 1k on basses, £500 for the amp, £300 or so on studio gear (then £150 on my guitar setup, cheap and cheerful yet very decent for the money)
I buy used 99% of the time, so my rig is pretty cheap, but packs a massive punch and sounds great IMO. I've not really changed anything for a while with the exception of the addition of a fretless.
However, it did take me a while to get here, and i would estimate i've spent in the region of 3k or so before i got where i am