Welcome to EAB Gambit! Glad the Classic is serving you well
Just out of interest, when you say A1200's with graphical interference, do you mean faint lines across the screen when the CPU is under load? Or do you mean actual artifacts like on an overclocked video card?
My A1200 was one the first also and suffers from the CPU under load problem. It can be fixed with a simple resistor mod apparently (pic in the mydocs folder included with the ClassicWB), but since it isn't too bad and not noticeable in games I've never bothered.