ABS isn’t necessary – I’d go cheap for your first bike, there’s a good chance of dropping it off the stand, we’ve all done it!
I did 2 years on a few 125 (CBT), 2 years on a “restricted” 500 then onto a 650, then onto a 1200 BMW. The BMW was the easiest to ride and felt the safest – no revving it to death to go quick, just cruising along on torque. 🙂 Big bikes aren’t automatically fast and/or scary. They just need a bit more respect.
If you can afford it, just do your test and get a (cheap) big bike.
That first ride on the CB500 though, that was magic I’ll always remember! I was bricking it at the dealers, dropped the 125 PX off and was chatting to everyone for well over an hour because I was so nervous to ride the 500 for the first time.