24/7 pro sights

Which Taurus models (24/7-pt111 ?) have inter changeable sights? Or better yet which sights are best suited for the 24/7 Pro DS?

I just picked this one up in a trade, It is not a good shooter.. Heinie sights suck (my opinion, not to offend) What are some good replacements not breaking the bank?

Thanks.

just type in pistol type and sights and it should give some choices too look at