Keep checking the classifieds for the 10/22 they'll pop up occasionally and highly worth it, these will resell for a little loss later down the line if you decided to sell and there's a myriad of help and modification guides for it on the internet.
Personally I don't like the Colt 22 carbine just because I don't find it even close to the functions of my own AR15 clone. If I wanted a "training" type AR15 in .22lr I would probably go with the Smith and Wesson M&P .22lr carbine. The Smith & Wesson tactical rifles feature a fully functional charging handle, an AR-15 style magazine release, bolt catch and a two-position receiver mounted safety.
"Those who hammer their guns into plows will plow for those who do not."