First of all, you do not need a data plan to access the web on your 7135. You can connect via QNC which uses your minutes. I have free nights & weekends so that works for me.

Since you are mainly interested in using the SK for data, you may want to pay attention to the GPRS signal issues. There are many reported problems getting and maintaining a data signal. You may want to do some more research on the Sidekick before locking into a contract. Check out the link below.

And In case you have problems finding a new SK, check Ebay. Everyone seems to be dumping their old units.

http://www.hiptop.com/forums/viewforum.php?f=34