I don't think that it is worth you buying a whole new system. What you have at present is pretty good so I think that a few changes to what you have will make almost as much difference as a whole new system, be better in some areas, and cost a lot less.
Those changes would be:
Buy a new monitor, namely the U2311H. This uses superior panel technology (E-IPS) which makes it better than any of the TN panel monitors mentioned previously, it's a little more expensive (just over £200 if you shop around) but much better.
Overclock your cpu, you may need a new cpu cooler for this (for example the gelid tranquillo). You would be very unfortunate not to see over 3.2ghz with your current cpu provided your motherboard is half decent.
Buy a new graphics card, for example any reference ati 6950 which can be flashed to a 6970 which makes it outstanding value for money.
Buy a solid state hard drive
If you don't already have 4gb of RAM buy some more.
So you have changed quite a few things but retained your cpu, motherboard and RAM. If this doesn't give you the performance that you want then you can buy the i5 stuff. If/when you move to i5 you have lost nothing because the cpu cooler, gpu and SSD are transferrable (if you've bought some more DDR2 RAM you will lose some money, but that has a strong 2nd hand value) and you have got a better monitor that if you buy it all at once and go for a TN panel.
Those changes would be:
Buy a new monitor, namely the U2311H. This uses superior panel technology (E-IPS) which makes it better than any of the TN panel monitors mentioned previously, it's a little more expensive (just over £200 if you shop around) but much better.
Overclock your cpu, you may need a new cpu cooler for this (for example the gelid tranquillo). You would be very unfortunate not to see over 3.2ghz with your current cpu provided your motherboard is half decent.
Buy a new graphics card, for example any reference ati 6950 which can be flashed to a 6970 which makes it outstanding value for money.
Buy a solid state hard drive
If you don't already have 4gb of RAM buy some more.
So you have changed quite a few things but retained your cpu, motherboard and RAM. If this doesn't give you the performance that you want then you can buy the i5 stuff. If/when you move to i5 you have lost nothing because the cpu cooler, gpu and SSD are transferrable (if you've bought some more DDR2 RAM you will lose some money, but that has a strong 2nd hand value) and you have got a better monitor that if you buy it all at once and go for a TN panel.
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