Actually I got lucky with the tank, Greg just happened to have a piece of tinted 12mm glass 2400x977, so the price was a lot less than it could have been. Originally I had asked for a price for 900 wide, but then asked how big the sheet of glass was and said just make it that wide. It only just fitted in his van!!
But yeah, the tank is about the cheapest part, then there's the stand, sump, pump, heaters, and all the other little bits. I've spent about $300 on bio media (noodles and bio balls), over $80 on plumbing, $90 for a sheet of 17mm treated ply, it soon adds up!! Still haven't decided about lighting, will probably go for four 4' T5 tubes in a custom hood, more $$$$. I had thought about going for a larger DIY tank out of ply but none of those bits can be done any cheaper, I'd only save money on the tank itself.