I bought the Academy 1/72 A-10 recently.
You'll want an aftermarket cockpit and a Hasegawa weapons set (weapons are in the kit but not well shaped)
For 1/72 its not bad, the shapes and contours are about right and I've run into no real fit problems.
If you by chance run across the old Matchbox A-10 (not likely, but if you do) don't touch it unless you REALLY know your stuff about the A-10. That kit came out in the 70s and actually represents two prototype versions. Its gun looks way too small, but If I recall correctly the prototypes did, for a while, have 20mm cannons in place of the 30mm service version.
The recomendation for Italeri is a good one, but watch out for Italeri decals, I've never had a lot of luck with them sticking down