Enduro,
I would do as Avaro has suggested in putting it all together your self.
once you do this, you will never need to take your PC anywhere to have things looked at or fixed, for the most part.
you will know everything about your PC and how you set it up because you built it from scratch.......just take your time in putting the 1st one together, do not rush it and hurry yourself because you can't wait to load up AH and check your FPS rate, lol.....
it is very easy.....no different than building a house or shed, measure( check) twice............cut ( install/plug in) once.......
building.putting it together yourself, setting up the BIOS & installing the OS yourself, then you know your system..letting someone build it and install everrything, then you do not know how they did it or how they set it up......
if you decide to pay someone to do it ( a local PC repair shop for instance ), then ask them if you can watch them build it so you can learn how it is done, and see that your parts are not switched out ..........not that it happens on a constant basis, but I have known friends and family who took PC parts to be installed or PC's to be built, and a year down the road or so they find out they do not have what they bought in their PC's........they have used or lesser quality products vs what they dropped off at the PC shop, to be installed.....