The first three Immolation albums are pretty much untouchable but my favorite is still the debut (Dawn of Possession).
I'll go with Close To A World Below, although to reiterate the sentiment here: all their albums are masterpieces.
The excuse you give for your bands lack of creativity is about as good as telling the teacher your dog ate your homework. And why are you bringing another band to "back up" the whole age factor in your band?