I would check out SirNobody's website which has an archive of excellent T2 decks up until 2008?
Then you could look back at older decks in the deck building section which were successful from past nationals.
More current decks will be in this section and give you an idea what's being tried now.
That should give you a good start about the very different and fun ways T2 decks can go, with the understanding that some of the older decks have more counters today that they did back then.
Then when you have an idea/skeleton of a deck you can post it here if you like and get more help for it.
Have fun!