I have been playing acoustic blues for quite some time. My father finally convinced me to put the acoustic down and jam some electric blues with him. Well, I have no amp or electric guitar....So I went out and got a Fender 62' American Vintage Strat. Now I need something to play that thing through

I was looking at the following:
Fender 65 Twin Reverb Vintage Reissue (2x12 85watts w/vibrato)
Fender Blues Deluxe Reissue (1x12 40watts)
Fender Blues Junior (1x12 15watts)
I like the 65 Twin but the lack of onboard distortion or drive is confusing me. Will this amp naturally break up and distort at a certain volume? We play Texas style blues and slight distortion would be nice. I think the Blues Jr. would be adequate for practice but may not have enough to hold up with 2 other guitarists.
Also, if I were to go with the 65 Twin, what would be a good pedal for distortion?
Thanks!
Muggs