If you aren't completely relying on a huge screen, you could get the Retina Mini at the same price, and it has the A7 chip, etc. It's a smaller iPad Air, and it's a bit cheaper. But, by now you may be able to find some decent discounts for the iPad Air, or you may be able to find a lower price for a refurbished Air.
OR, you could wait just a little later into the fall and get an Air even cheaper. Even though it won't be "New" anymore, and you would still be in the iPad 4's situation, (a generation behind) but you would get another year before it is 2 generations behind, whereas this fall the iPad 4 will already be 2 generations behind.
Not sure if that makes much sense, it's just hard for me to explain that. Pretty much, of you wait just a couple more months, you would get the Air at the same price as the 4. This would give you an extra year with the device for only waiting a couple months. If you get the 4, it presumably will be dropped after iOS 9 or 10, where the iPad Air would be dropped after iOS 10 or 11.