The AKG K701/702 are known for being slightly bright with a tendency toward sibilance. Avoid the Gilmore Lite, as it also can sound lean/bright -- it was voiced to liven up HD650s. If you want solid state at a low cost, you should look into the Heed Canamp, which pairs well with the 701/702 and is fairly inexpensive. But overall, I would recommend going with tubes -- either a Woo or a Darkvoice.
You might also post this question on Head-Fi, where you will get a lot of responses. You could also just do a search on Head-Fi for threads started by "Skylab". He has posted reviews of about 20 different headphone amps that span the price range from $300 to around $3500.
You might also post this question on Head-Fi, where you will get a lot of responses. You could also just do a search on Head-Fi for threads started by "Skylab". He has posted reviews of about 20 different headphone amps that span the price range from $300 to around $3500.