I've been looking around the net but there are mixed opinions.

I've ordered my CPU 800W peaks at 900w
AM3 CPU x4 3.4ghz
going to get 8 gig of DDR 3

But the motherboard is the problem I like Gigabyte boards and thats what I am going for.

I've been reading about sata 3 however reviews of people are saying that its not worth getting boards at the moment with them as its just a fancy marketing ploy and they dont really work as good as they should.

However I have a Gigabyte board already that is AM3 cpu ready and will take the CPU I have. it uses DDR 2 (8gig) and has sata2 controllers.

This new board has - usb 3.0 and SATA3 and Esata.

Is it actually worth getting this board costing around £75 or am I best waiting at the moment until the above is more supported?

I personaly wouldn't rush to get the latest and greatest, since you have a compatiable board, use that and take the money you save and put it to use with other gear. like drives, graphics card, or memory.

I'm assuming you mean PSU (not CPU). Which specific Gigabyte board are you thinking of getting? The 890FX boards are nice (890GX for built-in video). SATA3 is nice and can be utilized if used by a SSD with a SATA3 controller (Crucial C300 or newer SSDs being released this year). USB3 is much faster than USB2.0, but you need a USB3 device (and cable). There are plenty available now.

BTW, DDR3 RAM prices are real cheap now.