Noob in San Antonio Options

[robidunno]

Hey everyone,
I just wanted to introduce myself to the forum. In the next week I'm starting to refresh my brother's 94 ST Coupe. As to my knowledge it's rust free as it's been in the southern portion of Texas all it's life. I started looking up things on ToyotaCelica.com site, but it didn't feel like a home. Too vague and general. I presently daily drive an 85 Supra that's been my pride and joy. I've been a member of Celicasupra.com for quite some time, so I know how to use the search function. That's not to say I won't ask a random stupid question now and then. At present I'm trying to assess the normal wear items that need to be replaced, so as to be prepared for what lies shortly ahead. The car has around 207,000 miles on it and is now starting to have some mechanical fits. The items that I'm already planning on repairing or replacing if needed are Struts, brakes, tie rod ends, clutch, suspension bushings, ball joints, timing belt, motor mounts. The ignition system was given a tune up almost exactly a year ago (roughly 7000 miles ago) but I'll still be checking it out.
My brother isn't exactly mechanically inclined, and I'm presently in school for ASE certification here at the local Community College.

If you kind folks can think of anything that is normal to wear out that I haven't mentioned, I would certainly be appreciative.

Now for my first actual question. The stock exhaust manifold has developed a crack from what I'm told. Is it better to replace it with another OEM type part or check for aftermarket upgrades? In my opinion If something's broken I usually upgrade it to something better. However as it's not my personal car... If I was to upgrade, is there a downside to the part? IE tendency to crack, fitment issues, etc...