I used to have a C=128 and loved that thing. Its true there are really no native C=128 games, but there was a lot of native 128 mode shareware.
One thing I would get if you can is a copy of Basic 8 if you are interested at all in writing some of your own stuff. It had some pretty awesome support for the C=128s extra graphics capabilities and memory. In 128 mode you have access to some higher resolutions, more colors, and more gfx memory (too bad its not a 128D in that regard hehe).
Also, keep an eye out for CP/M stuff too, lot of good apps for the CP/M side of things.
