ARM is a famous RISC CPU. This brings simpler instruction set. And it is easier to learn.
There are some common ideas and implementations in 6502 CPU, and RISK CPU's. If you know 6502 (or 6510) it will speed up the thinks.
The people who designed it did love the 6502, although I'm not sure it helps much. People say the 6502 and 68000 are risc-like, but they are not not. I would put the arm in the same category.
MIPS R3000 is definitely RISC, it's my personal favourite but delay slots make it hard to get your head around if you've used CISC before.
