Either view through rings or a removable scope setup. I am not big on removable scopes, but if it will come back to within 1/2" that's fine.
View through rings usually put the scope up too high for my taste.

I am upgrading my hog rifle a bit.

Its a 338/284 and I am setting it up to shoot heavy high BC bullets, like a 250 gr Sierra GK or 250 gr Lapua Scenar.
Its on a long action so I can hang the bullets out far and can get about 2500 fps from a 19" barrel.
100% hunting rifle.

One field I hunt in is about 800 yards so I want like a 4-16x scope that mils or ranges at 16X.
All fine and dandy, but this is the same rifle I like to take into the woods with a heavy round nose bullet
and a 4-16x does not cut it in the woods. In that situation I would just rather have iron sights or a 1-4X.

I have been thinking about a picatinny rail mounted peep sight, maybe like for an AR15.
http://www.midwayusa.com/viewProduct...tnumber=486921

with this front band sight and insert
http://www.midwayusa.com/viewProduct...tnumber=743094

BTW how do these things mount to the barrel ??

For a scope I don't know which scopes mil at its highest power like 14x,16x,18x except maybe the sightrons.

The Nikon BDC reticles ranges at 12X, but I could just rework it for 16X
The Nikon buckmaster 4.5-14x mildot looks nice.

I want a lot of eye relief too, like 4" and maybe $300-$350

A Burris SixX 2-12X would be nice and thats wide enough I dont need iron sights.
Expensive though at $670.

A burris fullfield 4.5-14x looks decent too.