the corksport is a much larger core with more direct and (i believe) larger diameter piping. I'd say it's easily a better system for moderate or even fairly large power goals and you can get a nice bov with it.
hiboost comes with an old-school HKS bov that isn't great. i have it. it leaks. The pipes are so-so on fitment, not bad but sometimes come apart. Don't get me wrong, i have the hiboost and it's GREAT; just small issues, and of course now i want bigger because my goals have since increased.
Yes, the CS you will have to remove the A/c fan, but that shouldn't be too big a deal, i think you can get a spal slim fan to replace it?
If i were to custom my own kit, in all honesty it would literally be exactly like the CS. it's awesome.