I'm going a full exhaust (Gintani sport with Gintani x-pipes), I already have a MS filter, will be getting underdrive pullies, and will also go with a tune after that. A little ways to go, but I think without a SC those are the only ways to add any sort of noticeable power. The intake kits you describe I think are generally viewed as excessive and overpriced for the little gains they offer. I think most people agree that a new filter will do the job and is reasonably priced.
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel