Please define what you mean by panel saw. Do you need an 8ft rip, i.e. a true panel saw, or would a half-size rip, i.e. 4ft be enough?
If an 8ft rip is what is needed then will the use be industrial or trades? (I'm assuming this isn't a hobby request)
Personally I don't think there's much by way of quality saws available new at that price - you really have to budget £7.5 to £12.5k to get a durable 8ft rip panel saw. If you'd lkike to refine the criteria I'm sure that Dom, myself and a few other true panel saw users could give you some useful feedback
Regards
Scrit