isnt the inwinn a mini atx case? as its really small.
as for the case option, i would stick with the elite 310 case along with the tripple copper. if you could, i recommend adding a side fan to the case or request pcs to do it for you by calling them up and they will note it down on your order.
if your able to stretch youre budget, go for the t900 to get better cooling.
shouldnt be alot as its only a small side 120mm fan i believe. if remember properly (no guarantees) they may do it for free which i have heard or read somewhere on this forum, but call up and ask them tomorrow unless and admin could confirm it on here.
Call them with this number: 0844 499 4000 then let them know