Looking for some suggestion on the build

Hi mate, I live in the UK, but everybody here seems to use newegg.com for their quotes, and i believe they ship to canada, so thats what i've used for this build.

Because you say that you need it heavily for multitasking, my best bet would be go with an i7 930. You get hyperthreading (which the i5 750 doesnt have) and the i7 930 has replaced the 920, and it has more headroom overclocking.

CPU i7-930 - $289.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

MOBO GIGABYTE GA-X58A-UD3R - $209.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
(the best and cheapest 1366 socket mobo)

CASE Antec 300 - $54.95
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
(nice clean and understated - obviously you can get flashier ones with LED fans etc)

GPU ATi 5830 - $219.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
(this is the mid to high end of the graphics range, if you want a 5850 or a 5870, then obviously they will cost more, but game better. If you have no desire to game new titles whatsoever, then go for an ATi 5770 which costs around $152) The 5830 will game very well, providing you dont have a huge monitor 1920x1080 upwards)

RAM OCZ Gold 6GB 1600 - $169.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

HDD Samsung F3 1TB - $79.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

PSU XFX XXX 650w - $99.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
(i've just got this PSU after much advice from this forum, its really strong, its made by Seasonic who make the best units in the business, and it looks great, IMO what more do you want?)

OPTICAL Sony DVD-RW - $20.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU COOLER Scythe Yasya - $54.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
(again, i've just got this cooler, its the latest by scythe, who make great coolers, and IMO its the best price/performance cooler you can get, and as a bonus its quiet too!)

Total of this build is $1200.78
(This is a bit over your $1000, but you can trim it down with a worse GPU, slightly slower ram etc)

Hope this helps!!

^ Well for multitasking, IMO the 1055T would be a good option...and also when overclocked, would perform as good as the 1090T...
Though the i5 750 would be good, but not sure how much better it would be when compared to the Q6600 as that is a good CPU IMO...So having 2 extra cores would benefit in multitasking...
So if you want a cost effective solution, then the AMD or the i5 are better options as the platform cost of the i7 would be higher - X58 boards and Tri-Channel...

And also I am leaning towards AMD because their next gen CPUs - Codenamed Bulldozer would be compatiblw with their current AM3 boards...So that opens up the option of upgrading the CPU later on...

CPU - 1055T
Mobo - A good 870 chipset mobo from MSI/ Gigabyte / ASUS
Or if you dont need a discrete graphics card, then get a 880G mobo
RAM - Preferrably from GSKIllz/ Corsair
PSU - A quality 500-550W from Corsair/ Seasonic/ Silverstone/ PCP&S/ Antec

I agree, from a cost point of view, the i7s are alot of money, but the performance is greater, so it all boils down on how much you want to spend

On another note, the review here highlights the performance of the 1090T against a i7 930. Obviously the 1055T will be slower again, and bear in mind that the i7 930 can be seriously overclocked, thus increasing its lead even more
http://www.bit-tech.net/hardware/cpus/2010/04/27/amd-ph...
(the whole article is a pretty good read - but i've just linked the multitasking scores)