Kanda do a nice little pre-built 8051 starter board which you can get with a P89c668 on board..
It also has facility for 32k external ram and memory mapped LCD.
Best of all is that it comes with a cable and ISP software to download your code to it..
And they only want $50.00
www.kanda.com


If you want (most)the above and the ability to emulate and step trough your code in real time..then take a look at the Cygnal kits ,which are great at only $99.00