Yup, if it fits in your price range, and you're willing to buy used, i'd go for the dx7 and get a lemon rx....BUT, if you can get a bit more scratch, I would jump at a new dx6 with the free rx.
Lemon rxs...
I believe they ship out of china, but so do the orange rxs from hobbyking (they never seem to be in the us warehouse), but there are a couple places to get them in the us, Lazertoys being one of them.
I have used several of them, work just fine. They now have a dsmx verion that i haven't used yet.
When i was looking at txs the first time, I was up in the air over whether i "needed" a dx6i or a dx7s. I went for the dx7s because it left room to grow. I never regretted it. I don't need the 7 channels, but the 20 model memory is/was great (the new dx6 has about eleventy million memories (i don't remember the real number, but likely more than you'll ever use) and buying new you get things like a warranty and product support (should you need it).
Or....you could also go the hobbyking tx route and get an orange tx.
http://www.hobbyking.com/hobbyking/...0_Model_Memory_and_3_Pos_Switch_Mode_2_.html
I have never touched one, so I can't give a good review, but it is a DSM2 tx that will work with Horrizon hobbies bind and flys, spektrum rxs(dsm2) and lemon rxs. I come with the nearly nonexistant hobbyking product support as well.
Final note...if you have $130, and the dx6i works for you, goto horizon's website, buy the dx6i with the free rx, and go fly!