I've never heard anything but good things about the 525 mag - used a lot for drum on the OBX. Good line capacity, good drag, and very strong.
The jury is still out on the Sports Mag, seems the mag adjusting ring likes to break off - it's pretty much the same reel as the Mag Elite the only difference (I think) is that it has the ring instead of the lever mag adjuster. Depending on how long ago the reel was manufactured you'll also have to switch out the crappy Abu drag for their new Carbonex drag washers (which are the cats arse)
If you're going to use it to chuck bait I'd go with the Penn. If it'll be used for plugging I'd go with the Mag Elite with a levelwind.
I have the Mag Elite and I love it, it's one of my go to plugging reels. One of my best friends has the Sports Mag, I've plugged with it and can't find any performance difference.
"I just wanta play everyday despite small nagging injuries --
and go home to a woman who appreciates how full of crap I truly am"..... Crash Davis