Not necessarily. The refresh rates on most cards is set to 60hz by default (software wise). Unless you plan on using a large resolution (more than 1920x1080) it won't strain the GPU too much. However the smaller the resolution, the less pixels it will have to refresh and the less load there will be on the GPU.
As for the setup you linked, it's a decent build but I'm not sure it's fit for what you want to do with it.
- The i7 2600k is good, but slightly overkill. an i5-2500k reaches similar performance for a lot less money, and you won't notice the difference. the i7 has a slightly higher clockspeed but mostly it uses hyperthreading where the i5 does not. This only matters if the application using the processor specifically uses that option for multithreading (think adobe & exclusive software you can't get unless pirated).
- 8GB DDR3 is not bad but go with 12/16 if you want the option to expand in the future. RAM is dirt cheap atm, and a little more can't hurt.
- Personally I would get them to swap the OCZ SSD out for a crucial M4. OCZ is a semi-budget brand, and the performance they claim their disks have can never be reached unless very specific conditions are met. Not to mention it uses a lot more watts than most SSDs. a Crucial M4 has better performance in general and more reliability, for just a few bucks more.
- The normal harddisk is large, but runs at 5400 rpm which affects the smoothness of the bots aswell. This isn't a problem if you're just browsing some pictures or whatever but running that many applications at a time from the same disk will result in slow/stuttering clients (think loading screens, areas with lots of graphics, etc).
You will also save a considerable amount of money if you put it together yourself. Doing this will save you at least 100 bucks, and its completely overrated to have a tech do it for you. Putting it together will take you no more than a few hours if you're inexperienced. there are many great (video) guides out there on how to do it step by step.
Not paying a store to do it, including a cheaper windows license will be able to afford you additional RAM memory or keep some money in your pocket.
It is ofcourse still your money. However if I had your budget I'd make those changes, if not build it from scratch.
