Reccommend me a 5.1 home theatre system

[Leonheart777]

Hey guys, I am fairly new to the whole Blu-ray scene, I have a Ps3, and a Full HD 16:9 24 inch monitor.

It's surprisingly really good, only paid 350 for it, BenQ G2411hd.

I have my Ps3 hooked up to it via HDMI, and Logitech x-540 speakers hooked up to the headphone jack in the monitor (Green cable plugged in, the yellow and black cord not even in use)
X-540's> http://www.logitech.com/index.cfm/sp...s/234&cl=au,en

It's 5.1 surround sound, I really like them and it sounds really good. Although I don't think they are purely doing 5.1 properly because I have the speakers in matrix mode, which makes them 5.1, they are not even connected properly.

I am thinking of buying some speakers, I thought you guys could help me out.

$600 budget, I am in year 12, so I am still with the parents haha, my room is...very small, I have a wall directly behind me, which can be used for rears, as I am right now, http://img142.imageshack.us/img142/2029/rears.jpg

My desk is against a wall as well, so I could mount the speakers on the wall, as I have done here, http://img299.imageshack.us/i/frontspeakers.jpg/

Here is an overview of my desk, as well as the wall where the potential fronts can be put http://img81.imageshack.us/i/overviewz.jpg/, the wall is about a 1m higher than the picture is showing.
I have a sub on the floor to the right, next to my desk. It is infront of the wall, so it gives a really good sound.


So yeahhh, as you can see, there is not much space, There is hardly any room on the desk, I use it for my laptop as you can see, I also use my monitor for my laptop.

I will be watching movies from my bed, which is behind the desk.

I was thinking of getting a reciever and then the speakers, which I then hook up the ps3 via hdmi into the reciever, then get another hdmi cable from the reciever into the monitor, would that work?

The monitor only has one HDMI input, and the Ps3 has only one HDMI output, soo yeahh, kinda out of my depth here haha, I just want the proper 5.1 surround sound eh.

So yeahhh, hopefully I gave enough information for a good reccomendation, thanks guys.

I also live in Australia if that's relevant