I'm assuming your canadian, so I'm looking at the canadian section of newegg. Shipping is expensive so you might want to find an equivalent dealer.
Case:
http://www.newegg.ca/Product/Product.aspx?Item=N82E16811129066&cm_sp=Cat_Computer_Cases-_-Spotlight-_-11-129-066If you want blue, thats your guy. It's this week's featured deal, comes capable of watercooling if you want to, has awesome ventilation, will fit everything, and is like 55 bucks with the deals. Antec is a good company to go with, or coolermaster.
http://www.newegg.ca/Product/Product.aspx?Item=N82E16819116504 Processor, don't crap out on the processor. If you're willing to spend 800 bucks, do NOT get AMD. They're way behind intel, and you can get an i5 (the top of the line unless you're going to render something) for like 215 bucks WITH shipping to canada. This processor will serve you well for a long time, and save you money in the long run. If you're building a computer, use this.
Motherboard:
http://www.newegg.ca/Product/Product.aspx?Item=N82E16813128540I'm not a pro on motherboards, but this one seems cheap and will get the job done. Don't get a super cheapo one because it will drag your components down. This one has usb 3.0, which is good for the future. If you're going to look around MAKE SURE it's LGA1155, and you should be good.
Graphics card:
http://www.newegg.ca/Product/Product.aspx?Item=N82E16814130770This isn't needed. Hopefully you've read this far, because the most important thing is here: With the high end cpu I picked, you do NOT need a graphics card. You can easily run batlefield 3 or any game on high with just the cpu's integrated default graphics. They are kick ass on the ivy bridges. Make sure the motherboard supports integrated graphics (I'm pretty sure that one will, google should hold the answer) I'm not factoring this in the price because the processor basically has graphics as good as this in it. But if you want, this or a 560 ti is high end but not super nerd rich 1000+ gpus.
RAM:
http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231309The last thing I'm not crapping out on for you. Since we're on a botting site, I'm assuming you want ram to support like 10 bots at once? There's your guy. If you just want enough for the average user, look up 8 gig DDR3, it should be half the price, around 40 bucks.
HDD: This is a tough one. Basically any hard drive will work. You can go with segate, they're pretty good. Western Digital is the highest end in the business though. If you're going to splurge on a WD, get a caviar BLACK. They're the best ones by far. The others aren't worth it. Here is the 500 gig WD caviar black, you can get 1 terabyte for like 20 bucks more though, and 1.5 tb for 20 bucks more than that.
http://www.newegg.ca/Product/Product.aspx?Item=N82E16822136795Disk Drive: Not even needed anymore, pick one up for <20 if you are going to use it to install the OS and drivers.
OS: Not sure what you're going to do. Many people don't buy their OS, one way or another. I wouldn't really trust a lot of the alternates, but here is windows 7:
http://www.newegg.ca/Product/Product.aspx?Item=N82E16832116986 You could also do linux or even mac if you want.
Power supply:
http://www.newegg.ca/Product/Product.aspx?Item=N82E16817341017You shouldn't need more than 600 watts, especially without a gpu. This one has a 25 dollar mail in rebate, so its a great time to buy. Don't get a crappy power supply, it could cost you time and money. Spend the extra 30 bucks and save headaches and like 200 bucks later when the crappy one fries your cpu.
This comes to about 800.This build will satisfy you for years. Hope you enjoy, this took like 20 minutes to find all these