Best way to get an accurate reforge, gem for int, go into proving grounds, and use the reforger there to get 15% hit.
Or you can jump into Mogushan palace CM right by shrine.
On topic: I'd suggest you follow the CM BiS list found here: http://www.mmo-champion.com/threads/...oP-CM-BiS-list. It shows what itemization, gemming and professions you should aim for assuming you are going to play destruction. When it comes to hit you do not want to gem any hit beyond purple gems for set bonuses if you don't really need to. My stat weights I had a while ago (memorized~) was 4.2 int 1.8 mastery 1.6 crit and 1.5 haste.
If you're going just for gold, you shouldn't bother so much as to build another set or do a full reforge/regem for it. The only thing you'd really need to change would be your meta gem (which you can easily just get a lower ilvl helm and put a burning primal in it). However, if you're looking to push times, or help carry others etc, then yeah, refer to the spreadsheet link found in the thread that Tramzh posted.