Thanks for the reply, looks like exactly what I need.
About supplies: I'm from Ukraine. AVRs are the most popular MCUs here (side-by-side with PICs of course :)), but since summer in DIP packages only ATMega8A and ATMega16 are easily accessible (that's common problem for Ukraine and Russia, I don't know a reason) and the prices for all packages goes up (even in $, not in local currency). There are a lot of forum topics in local forums about this.
The most funny thing is ATMega328: most of sellers in my town tell me that such MCU simply doesn't exist. I've pulled one from my Arduino to show them :))