Since you have been able to unroot it with my guide, you are now at pure stock (AFAIK). As John posted, the 'market' _might_ update after accepting terms to Google Play. But when I used my A855, it didn't really make much difference whether it showed "market" or "Google Play", the only real effect was to make me feel 'out of date' or not. IIRC, stock Android on a A855 never updated to Google Play, meaning that since you are running stock, you are not running what most consider a "ROM".
However, if it's that important to you, I will try to upload the latest "market" to my server sometime and if you have "allow unknown" (sorry, I'll have to boot up my A855 to give specifics) enabled on the phone it should install. No guarantees, though.
IMHO, your phone should be good to go.
good luck