Most of those problems would probably take about half an hour for someone to fix. The horizontal problem is probably a cap problem if you haven't already tried to adjust the horizontal size. I bought a couple of cheap machines as they had screen issues and most required minor adjustments or recapping. The best one was a Virtua Fighter which had major screen tearing issues, the pot looked worn, replaced it and it worked fine. Cost of the machine? Nothing. If the screen is working then the chances are it's an easy fix.
well i plan to sell the screen at ebay as soon as my tri syncs arrive, so i dont think its worth to brother with it, but repace every capacitor at the chasis would not be expensive, i agree