As usual some very good tips on here and here is my two pennyworth. Most sound guys prefer a flat sound, then proceed to screw it up. As a clean DI I use the Orchid Classic, Can be used in front of you amp or from the send of the effects loop. I honest;y feel that a mic for bass is almost a waste of time, if you have more than one speaker driver, a compete waste of time.
I went to see a very well known singer last night (name omitted due to the risk of ridicule). It was a very professional show that was almost spoiled by two things. The overly loud kick drum and a bass that was so processed and loud that I could not tell whether he was playing the right notes. The result was the vocals were wiped out at various crescendos and the bass (or more correctly rumble) just overpowered everything. The moral of this is, get a radio system and listen to the sound check and tell the sound guy if it sounds crap (I did and it split my last band). I know have a new band and am happy with the sound.