If you're looking for a computer that won't slow down and that can even handle some games I think you've found the right choice but if you need a better performer i suggest you get this https://www.ozbargain.com.au/node/323913. Don't forget to email them if you want windows 10
Here are the Specs:
-JV APPROVED!
-Win 7/10
-Intel Core i5 3570 3.4Ghz Quad Processor
-8GB DDR3 RAM
-250GB HDD (Hard Disk Drive)
-Intel HD 4000 Graphics
-USB 3.0
-really compact size
-Important thing to note No wifi but you can overcome this issue by sticking one of these in the back http://www.gearbest.com/network-cards/pp_627896.html and obviously no hdmi
An alternative is the HP 8300 (http://www.ebay.com.au/itm/201689344613) but why choose i5 3470 3.2Ghz over i5 3570 3.4Ghz and Intel HD 3000 over 4000 but this is bigger so higher chance of you fitting in a graphics card
Original 20% off Selected Stores at eBay Deal Post
Or if you really tight why not buy this $88 pc http://www.ebay.com.au/itm/HP-Compaq-8000-Elite-Intel-Core-2… (credit to neil) (Only 2 left) and hook yourself up with a $30 monitor http://www.ebay.com.au/itm/Lenovo-ThinkVision-L1951p-19-Wide… throw in a graphics card and you will be able to play games at decent frames. In fact this was all typed up via a good old intel core 2 duo and yes i can keep 10 tabs open without crashing =) Source: https://www.youtube.com/watch?v=Vvih2sEeMgw Out of stock
If you're also in need of a monitor: https://www.ozbargain.com.au/node/323976 (Your probably going to need some connectors)(nm out of stock anyways)
If there's any issues you can contact the rep here https://www.ozbargain.com.au/user/189195
Wow 62 already sold, better hurry before it goes out of stock.
Edit: Seems to be intel hd 2500 instead of 4000.
I got one of these a while back, they are great value.
Just be aware there's only enough space for ONE internal hard disk.
I put an SSD in mine and it flies… I've broken my all time record in Minesweeper using it !!!