Personally, I would go with the rMBP.
I would not be able to live with the screen on the MBA for 3-4 years (how long I usually keep my MacBooks for)
Also, The Silver bezel on the Air is a no go for me.
Target's going to have the iPad Minis for $299 + you get a $75 Gift card, on Black Friday.
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oh ya, Save on Tax ($120ish) by buying from a reseller located out of state.
Power Max, MacMall, B&H Photo, ETC
If you buy from MacMall, they have a 3% promo code.