Here's a rough one for without a monitor and for new pieces, if your planning to get used pieces then you can get under $500 so you could potentially get a monitor with the savings
PCPartPicker part list: http://ca.pcpartpicker.com/p/1TVhJ
Price breakdown by merchant: http://ca.pcpartpicker.com/p/1TVhJ/by_merchant/
CPU: AMD FX-8320 3.5GHz 8-Core Processor ($157.99 @ Canada Computers)
Motherboard: ASRock 970 Extreme3 ATX AM3+ Motherboard ($69.99 @ NCIX)
Memory: Corsair XMS3 8GB (2 x 4GB) DDR3-1600 Memory ($55.99 @ Amazon Canada)
Video Card: XFX Radeon HD 7850 2GB Video Card ($149.99 @ Memory Express)
Case: Thermaltake VM30001W2Z ATX Mid Tower Case ($40.51 @ DirectCanada)
Power Supply: EVGA 600B 600W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($39.99 @ NCIX)
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-10-27 16:13 EDT-0400)
This also comes with 2 free games from the 7850, I know when I bought my 7870XT I factored in the price because I planned on buying both bioshock and tomb raider, so it was a good deal for me.
When I bought my 7870XT it was $240, with two 50-60 dollar games(that's what I was just about to pay at gamestop at the time) buying that just saved me 120$, I also got FC:Blood Dragon from it.
now I think you get some games with the 7770 as well.
I also chose the 7850 for the 2gb and extra power compared to the 7770 because it seemed like you wanted to get a 1080p monitor, and if you like playing on higher settings it'll come in handy.
For monitors do you know if you want TN or IPS? speakers? HDMI or DVI/VGA?
If you want IPS and still be on a budget
2xhdmi, 1x VGA, built in speakers, IPS $150
1x DVI 1x VGA, No speakers, IPS $140
you can always get a converter later on if needed.
1x DVI, 1x VGA, 1x HDMI, Built in speakers, $155