I had an Uniquefire AA-S1 and a friend of mine has the K2. The K2 is way better than most of the lights you listed as choice. Build quality is above all lights I had/have, even better than the Hugsby's. I don't consider the K2 an expensive budget light (what was it, ~35$ ?), but a cheap high quality light with more similarities to Fenix's, Nitecores and Quarks. The Hugsby P32 (black) is great for the price, but it will be most likely a little less bright and build quality is a little less good, but for standard 1xAA's it's still my recommendation. It doesn't take 14500's though. There is a golden version of the Hugsby which is supposed to manage 14500s. I only own 3 Hugsby's in black (P32/P31) so I don't know how the golden one is. (but someone does... well kind of)
Most driver can't be good for AA/14500 equally, so you have to choose which is more important to you 14500 support, or high output with AA. If I had 14500s I would probably buy the K106 with programmable driver.(Review) Here are some of Don's measurements.
Update: ITP C7 Review, Kingpower K2 Review
My intuition tells me, by looking at the runtimes of the C7 that the Eastward, Hugsby's, new SS(from Manafont / LT )/grey Ultrafire C3 will be brighter on AA's.
Update 2: After reading some measurements... I would recommend the TrustFire R5-A3 for mixed use with 14500/AAs for near maximum output on both..