Heya, I'm the friend to which Rubbercarp was referring when he made this thread. And, I must agree -- Austrian is a fan-TAS-tic format!
As the Carp said, we don't have anything above set 13 (save for Age's End and some other promo-type stuff), so our "modified Austrian" is a ton of fun. It's so fun, in fact, that I'd recommend it to even those that do have cards above set 13. In this way, you could essentially make Austrian format so that each side of your deck just has to be "whatever Standard was considered at some point in time" (with the customized Austrian X- and R- lists, of course).
So you could do 1-10, 4-13, 7-Whatever. The only reason I find it necessary to recommend this is that I've come up with a few decks that required things from both Tower Block and War of the Ring Block, which wouldn't be possible without our modified Austrian format. It made me realize that I should probably suggest our customized rules so that other players could come up with similar combinations, if they saw fit. =P
Anyway, thanks again for creating this awesome format! It's allowed me to make a ton of fun decks!