I'll answer the last part of your question first - there are a *LOT* of Minolta AF cameras. Some are good, some are not so good, some are brilliant - just like any brand I guess. As good as Minolta MF cameras? Yeah, I reckon so...
Also, some of the early AF lenses were reportedly based on the optics of their MF brothers, so needless to say they are quite decent - some better than others, and some real gems in there.
What you need to know is if your friend has any SSM lenses (or has plans to get some) that he wants to use on the Minolta - not all Minoltas support SSM.
There are five or six series of Minolta AF cameras:
The first (1985-ish) series had model numbers "x000" - eg 5000, 7000 and 9000.
The second series were "x000i" - 5000i, etc
Then came the "xi" series - 5xi, 7xi...
After that was the "si" series - 600si and so on
Up til then, there was no SSM support - enter the single-digit series...
The single-digit series was (IMO) the epitome of Minolta AF camera development - models such as the 7 and 9 were outstanding, and are the pick of an excellent bunch.
After that we got the Konica-Minolta film bodies - all two of them, known as the Maxxum 50 (aka Dynax 40) and Maxxum 70 (aka Dynax 60). Not bad bodies, but a decent step backwards in my opinion.
So, if your friend wants SSM, the single-series is where it's at.
The 5 is a nice, compact, lightweight body that has SSM, high-speed flash sync, decent AF and so on. For me, it's a bit small, so I passed mine to my 12yo son who loves it
The 7 is brilliant. Outstanding. Awesome. Go through you thesaurus and find any similar words to these and add them to the list. It really is that good. Bigger than the 5, but still not *big*. A control layout that makes sense! Knobs and buttons instead of menus

The AF is better then the 5, the viewfinder is bigger and better as well. The 7 also boasts an LCD screen on the back that has various displays - absolutely brilliant! It also has SSM, high-speed sync, etc.
The 9 takes it up another notch - build is on another level, but it is rather heavier than the 7 - bigger too. It does have a huge 100% viewfinder, but loses the rear LCD of the 7, if that matters to your friend.
The only gotcha with the 9 is SSM - it was released before the 7, so it lacks SSM out of the box, but upgrades were (are still?) available that add full SSM support - many have already had the upgrade and it you can find an upgraded one at a reasonable price, grab it. If you find one that hasn't had the upgrade and think you might want to have it done - it costs several hundred dollars, so that might be a deal breaker for your friend.
On the other hand, if SSM doesn't matter, and a big chunky camera is OK, the 9 looks pretty good.
If budget is important, there are a few other well worth looking at. The 600si is another favourite of mine - handling similar to the 7 and 9 (ie brilliant), just a lovely thing to use, but AF is a bit more sluggish than the newer bodies. The 700si and 800si are also great cameras, but lack the control layout that I like - your friend might have different likes than me though.
Suggested shortlist?
* 600si / 700si / 800si for excellence within a tight budget (no SSM)
* 5 for a quick, light, compact performer that's underrated by many
* 7 for the best of both worlds - beautiful form and brilliant function
* 9 for the heavyweight champion - a bit simpler than the 7, but wonderfully capable
Hope my ramblings have helped - you can drop me a PM if you have any more specific questions.
Regards,
Gordon