I mic up bass cabs all the time and I usually use a mic with a fairly flat-ish response too. My personal favourites are: Beyerdynamic M88, EV RE20 and the Sennheiser 421 and AKG D12E. No big news there. I also have had very good results from a Beyerdynamic TGX-50 which isn't flat and does have a bit of a scoop.
Generally though, if I didn't have any of the above (although I am lucky enough to have them all in my mic box, bit of a mic hoarder) I'd usually go for a 57 or a 58 with a DI (with a high cut) over a D112 or Beta52a or other scooped kick mic. Depends on the band/bassist/rig/room/style though really...