Just to clarrify a few things.
The only construction difference between the 2002/03 R:11.20 and R:10.20 is the 10 has Carbon Power Channels and the 11 has Titanium Power Channels. Carbon does not absorb energy so it feels more lively, while the titanium absorbs vibration engergy so it feels more damp.
For 2003/04, the cuurent designations do not apply anymore. Gone are the approximated radius numbers in the name. Instead, the ski will be categorized into series (R, C, SL, GS, SX, E, TM...) and models within the series (5, 7, 8, 9, 10, 11, EX...) or named (SugarDaddy, BigDaddy, Stomp, Tweak, TeleDaddy...). Aswell, there will be a few women specific models (R:10W, C:9W...)
When asking for advice (here, at a shop or at a demo), refer to the proper model name. If you ask about a R:10.20, it will be for this current model year. Next year the proper name is R:10 (or R:10W). Previously it was Ride 10.20 and before that Beta Ride 10.20. Beta has been dropped from the name, since all intermediate to expert retail skis have Beta construction, and there is no need to be redundant. Only a few junior models use non-Beta construction ( and SG and DH race skis too, but they are not retailed).
So, that being said (or ranted depended on your interpretation), what models do you want to know about?