Shoe advice from people who know? (pretty please)

bprague

Alright, so I know there are a million of these but- I recently was fitted at a running store and was sent off with Brooks Trance 10's. Once a put 20 or so miles into them (broken up into 3 mile increments) I developed some posterior tibial tendonitis. My running store is willing to exchange them but now I'm not sure what to run in!

I'm 5'5"
132 pounds
Plan to move up to 10Ks every other day (once I heal and get my butt in gear) but recently been doing 5ks
Will be running on treadmill (all I've been doing for right now) and pavement (later)
Over pronate like a beotch
strike on my forefoot
And have a flat foot

If anyone can give me sound advice on this, I would so appreciate it. I'm rather lost after developing an injury from shoes that were recommended for me by a running store.