I'd actually suggest you get a new monitor. While the processor is a bottleneck, it's not so much so. The higher the resolution you play at, the less of a difference processor makes.
I'd suggest a new monitor. The Samsung 2494 or the Samsung T260.
The 2494 has built in speakers and hdmi so you can take it with for your consoles. Much easier to carry around than a lcd tv.
So you suggest the psu at 450w and the cpu is not that abig problem as the monitor?Will the graphics get much better with the hdmi port that i can use on the graphic card as the radeon hd 4890 also got hdmi port.Just comes to show,i bought this samsung lcd screen 4months back and with no knowledge the sales person said this is a very good screen and i will need nothing more.It just comes to show that you must do homework before buying,thanks for the advise