Getting rid of unused Card

So i'm looking for some advice on how to best proceed with these credits cards I have. Here's the story. Made some dumb decision at a young age and got myself into some Credit Card debt. Started opening numerous accounts and charging them up. I've since paid them all off, but here's the damage. I have 10 Credit/Charge Cards open all have zero balances on them now, but how do I go about getting rid of some.

I got:
1 card opened in '05.
6 (3 store cards) cards opened in '06.
1 Card opened in '07
1 card opened in '08.
1 Card(AMEX) opened in '10.

I am thinking I definitely want to keep the card from '05 for the credit history, but as far as the cards from '06 I was looking at keeping 1 store account and 1 credit card and keeping the card from '07 as well as the AMEX in '10. All (other than AMEX which is Pay in Full) have pretty high APR's, so i wanted to cancel cards and then request lower IRs. I want to buy a house here within the next 2-3 years so what do you experts think is the best plan to getting rid of all these accounts? Closing all at once? closing 1 monthly, etc.

Thanks,
Ry