the bike in general is old, but if you maintain it, it will last for a long time. as for the forks, send IrocRob a PM, he can help you with that. But theres a sweet killer of a deal on WERA for a gsxr600..
http://forums.13x.com/showthread.php?t=253113
there are also newer bikes for sale on there too, so the choice is entirely yours on what you want to do. But just keep in mind, for newer bikes, parts are so much easier to find at the track in case of a get off.