Take a look at the Blackburn line of computers. The readout screen is quite large and very easy on the ole eyes. Here is an ebay link to one: http://cgi.ebay.com/Blackburn-Delphi...QQcmdZViewItem

The 4.0 and higher are wireless and have a cadence option(wired) included. I have these on several bikes and am quite pleased with the durability.