Also a new owner of the HE-5LE, and ave been scouring the web for potential amp options. I may have missed some, and certainly it would be great to see the list grow as others chime in. Yes, some of these are out of the price range of the OP, but I only have time to cut and paste the list right now. But for now, here is the list of amps from the main HE-5LE thread mostly that have been said to work well with the HE-5LE:
Luxman P-1u
Bravo (similar to Indeed and some other clones)
Gilmore Lite
Matrix
RSA Protector, using a balanced cable (without balanced said it was not a good match)
Moth (via Speaker terminals)
Red Wine Audio 30.2 (via speaker terminals
Virtue One (via speaker terminals)
“For those who plans to drive HE-5LE by speaker amps: Please make sure your tube amp can drive a 38 ohm load. Some tube amp's output transformer only can drive 4 to 8 ohm. A solution is to wire two 8-ohm cement resistance in parallel. Solid state amp do not have such problem.” -Fang