the case does not look to be too bad but I would not go near the psu its unbranded and they will be making money on it. On the pc you posted earlier it had a corsair cx600 and the difference between that and the RM650 I said about is the cx600 when tested and I mean tested by someone with a strong electric background,when pushed it will only put out about 591watts and the 80+bronze spec is when it is putting out 480watts. the manufacturers play with the wording it`s just the blurrb thats written on the boxes the RM series is newer has better rating and better components and is aimed at enthusiast also has wires that you can take off so the case is less of a muddle when you build you don`t won`t to restrict airflow . any pc part you want you can type into Google i.e. I brought a xfx850w core edition,type "xfx850w core edition review" into Google and it will show you a hole page of different websites that have had the psu apart and gone over the design,the components and the performance and value for money,don`t just read one review read as many as possible about the bit that interests you and also take note of product codes as sometimes they release parts and then notice a problem with them and then release a revised version.
I managed to build mine for that money as I brought the parts second hand. I researched the parts and come up with a short list of 3 psu etc that i consider suitable and how much I would pay for them and then made shore i did not get sucked into a bidding war as i`ve seen part go for £5 less then the new parts on amazon but with no warranty (crazy) and I know enough to be able to check things over,I mean I would never by a second hand psu and put it in my pc without checking the voltage it was putting out as with second hand bits have no warranty and you could claim a refund but its not going to pay for a fried cpu and ram etc. this can happen from new but if buying from amazon they are pretty good about taking things back that don`t work so I think you are best to buy all Your bits from amazon for this build if that's the way you intend to go.
bits i brought of ebay
850w core edition £50
m5a99x evo r2.0 £48
corsair r300 case £30
fx8350 £95
hd6850 £40
new ram 2x4gb 1866 £60
new dvd drive £13
1tb hdd was taken from old pc it was a back up drive
your ??? about memory,you will be better off with 2 sticks of 4gb (2x4gb) as it is duel channel mobo,this ram is what i have in mine and seem to be the best price for any I`ve seen at £55 it is also quicker then the 1600 stuff you were looking at and would match the cpu and mobo spec.
http://www.amazon.co.uk/gp/product/B0069OG1RM/ref=ox_sc_sfl_title_5?ie=UTF8&psc=1&smid=A1AUCPBF2P18HS
not all ram is the same even if its rated at 1866 you need to look at the CL rating the lowers is better and it`s not as picky as it used to be certain mobo`s would not take certain ram modules but its best if you stick with the stuff from the link it was the the lowest CL and the timings i.e.9-9-9-27 was the lowest i could find,very good ram yo can check compatibility by going to crucial site and use their memory find table. any more question just post back