I echo the above comments about not transmitting to ATC. If you're in some remote Class G airspace, there might be some rare reason for you to transmit there, if nothing else to respond to a query about wind conditions or something.
ICOM is a robust brand of radio that's popular in the aviation, marine, and HAM worlds. I have an ICOM 2m walkie that I used when paragliding; it's on the HAM frequencies though. Midland might also make aviation radios, and they'd likely be a bit less expensive. Since you aren't supposed to transmit anyway, you could also buy a cheap scanner that covers the aviation frequencies.