The real difference in the quality guns is the trigger, and the new electronics are another step forward. Most cheap guns can be made to fit, just takes more time and effort. No gun can compensate for holding errors, inadeqate sight picture, or bad trigger technique. I average low 90's at ten metres and prefer my Steyrs for match cards but I practice at home with a FAS 604 with near enough the same results and also shoot my old FWB65 (bought new in '72 when it was state of the art) with similar results. A comparison is the Ladies world record set in the early 70's by Nina Stolyarova 391 ex 400 with a FWB65, current world record 393 set with a Steyr, the target is 0.5mm smaller, but hey no real advance.
But, even for a lower level shooter I suspect you will be more consistant with one of the top makes. Buy the best you can afford.
Good shooting and have fun
Robin