I originally used a peach tree decco, but it just didn't have the oomph to drive my hungry Senn 650's. I ended getting a WA-6 tube head-amp from Woo Audio and what a difference. Worth looking into.
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I assume you've visited HeadFi.org and Headphone.com (aka Headroom)? A Schiit Asgard 2 is avery affordable option. Even if purchased direct from Schiit, you have a 15 day trial period. They were available from Amazon at one point so 30 day returns if bought there but I only see used on Amazon right now. I use an Asgard 2 to drive Senn HD600s and AKG K550. It has a gain switch...so low gain for the AKGs and high gain for the Senns. Good luck in your search.