It depends on what you want to do with it/what kind of fights you want to have in it. In general, get a good hullbuster/shieldbuster mix, try to match the projectile speeds of your weapons. If you want to have codename weapons on it, you may want to go for some of the ones with 650 m/s projectile speed, to match them with Debilitators. You can buy the Debilitators (shieldbusters) on Roppongi Station.
The class 6 Fr. shield is better. I can only promote the usage of CDs for most situations.
Take into consideration that the Spatial is big and turns slowly, you are a very easy target even for SNAC shots. So if you plan to mostly fight fighters/bombers, maybe you should get a VHF instead.
Edit: I didn't change anything of that post Mr. Crab. (Except for this edit of course.)