Thanks for all the replies!
I usually use the DI to control the top end, but after the suggestion of using a small diaphragm condenser, I'm now thinking of dual mic'ing the cab with a SDC and something along the lines of a re20/atm25/d6.
With a DI that should give me plenty of control.
Also I like the guitar amp idea... It reminds me when had trouble with one particular bass sound a while back and I pulled out my old 70's Selmer Treble n' Bass head...
If anyone has one collecting dust in a corner, try a (4-string) bass through it. It gave a flat lifeless bass guitar LOADS of depth and warmth, not to mention lovely valve compression.
Thanks again guys.