commodore 64/128 question

[Jay West]

I was an avid C64 user, ran a C64 bbs for years, etc. etc. But when I got 
rid of it years ago, one never made it back in to my collection as I focus 
more on mini's than micros'.

I find myself wanting to acquire a C64 for my collection and gaming fun, as 
that was the system I had. However, as I understand it, the C128 has a C64 
emulation mode which allows it to run C64 software. I never had a C128 and 
don't know anything about it.

So, my question is - for the c128 people... if I really just want a C64, 
will the C128's C64 emulation be 100% and make me happy? If so I'd like a 
128 as long as I'm going for a C64 so I have some extra functionality to 
play with. But if the C128 won't run 100% of the C64 software, then I'd best 
just stick with getting a C64.

Advice?

Jay