Why not use a 65c02 or even 65816? (This is a 6502 forum after all. :D ) The bus is nearly identical and all the 65xx made today are spec'ed for at least 14MHz and will typically run quite a bit faster if the memory and peripherals are up to it.
Mostly because I don't need all that much speed and ...

I'm slowly working towards building an all-CMOS portable computer with a 6309 CPU at its core. I've come up with some rough designs, and I was wondering if there are any bad design decisions in there. Particularly, I'm worried about speed and how much current it will take to drive various chips on ...