I'd go with more like this:
12 lbs Maris Otter
2.5 lbs Rye malt
12 oz carared
4 oz crystal 60
4 oz crystal 80
4 oz chocolate malt
I like this, though I'm not a rye guy so I'd leave that part out.
20oz of xtal is good - I certainly wouldn't go lower with an amber, I might keep it at 24oz, but now we're splitting hairs.
While I do like to use different xtals for complexity, I agree with Tom here that I'd probably either go 40/80 or just use all 80. Not a great distinction between 60 and 80 IMO.
"Denny's yeast" is sold by Wyeast: WY1450. If you can only get White Labs, try Cali V (WL051) - I'm a big US-05 fan, but Amber?Red is not one I have ever enjoyed with that yeast.
oh - and I've found that unless you're using english chocolate malt (400-450L) you might be better off using the carafa at a lesser amount to get a deep red color. that american chocolate (Briess, etc.) is lighter and will make it more coppery IMO.