Depends where you are and how good you are obviously, but when I was doing weddings and functions I never played with a band who took less than a grand, and I played with plenty who took two to three.
I was always depping with really good bands, but I don;t know of any wedding or function bands who go out for less than £900.
As for gear, I got through all those gigs, pretty much three a week for 4/5 years, with an amp, one guitar, a wah, a delay and a phaser/chorus. The particular models varied. That was covering pop, jazz, blues, funk, disco, rock, soul...