Suzuki GSX750F, also known as Suzuki Katana has been on the roads since late 80s and has been quite famous, yet people have had negative views about this bike too, possibly because no matter how good it might be you still cannot compare it to pure sporties like GSXR and some even consider Honda 600F4i to be a much better bike. Katana comes with an air/oil cooled engine and newer models are far better than older models.
As far as buying the bike you mentioned is concerned, there must be some reason why it has been standing idle for a whole decade, some of the mechanics here also do not approve of this bike for unknown reasons, but I cannot second their views nor can I negate them, anyone who has himself owned a similar bike can give you a better opinion. But I have seen them on roads and the sound so awesome..
Availability of parts can be a problem for old models but then you can find them if you keep searching from Lahore or Karachi. Sometimes swapping the engine can also be done but that's another story..