Recommend me a Receiver ?

[Justnate]

Hey Guys, I have only just started to get into the home theater craze, so I only have a basic knowledge.

Anyway back to subject I am in need of some help so I thought I'd come to you guys.

Can you recommend me a receiver? I currently have a Pioneer VSX-519 and while it has served me well I feel it is not strong enough to power my speakers.

My Speakers consist of:

Wharfedale Diamond 9.4s Floorstands
Wharfedale Diamond 9.CC Center
Wharfedale Xarus 4000s Surounds
Wharfedale Pc-10+ Subwoofer
Sony Subwoofer forgot the model
And I also have a pair of Wharfedale 9.0 Bookshelves which are not currently in use because of the receiver not being 7.1

Okay so I would like the receiver to be 7.1 and have pre-outs if you guys can recommend me an amp keep in mind I live in Australia and things over here are ridiculously overpriced. My budget $400-800 AUD as I am only 17 but I will stretch it if it's worthwhile.

Thanks in Advance