Ivyinvestor,
You and your Fiancee share listening sessions? Lucky man! Do you two fight over the "sweet spot"...just kidding. Anyway, to try and answer your question, I've heard some really fabulous set-ups from Antique Sound Labs with my Grado's (SR-60@$75.) The A.S.L.'s can be a little pricey go to:
www.divertech.com/aslhb1.html @$299.00 US However, this amp has a seperate power supply and triode amp. section! If you are interested in using your fabulous Audio Refinement integrated-A.S.L. also makes a handy little gadget called the "UHC Signature Headphone Listening Device" @$150.00 US (NOTHING will remind you more of your current set-up as it uses everything you have except your Tyler Linbrook monitors with a "step down" transformer to convert impedance. If you want a really good solidstate amp. checkout the modern day classic Creek OBH 21 @295.00 US.
I hope I wasn't too late. Good Luck with your headphone/amp. mission! -Bruce30