I'm with you there Soupdragon: In my mind my X35 was virtually free since I saved £300 by not getting the 3D spec and emitter, I saved another £2K by not getting the X55 plus I thought I'd get £650-700 for my old HD350. However, the '350 hasn't gone anywhere as I now think I may as well keep it as a spare.
At least I genuinely can't think of anything I want to upgrade right now: I have the X35, Mini3D, Isco II, Darbee and Oppo 93 for visuals, plus my lovely Arcam AV9, power amps and PMC front speakers. However, I'm going to Rob Sinden's place on the 30th so who knows what upgrades I might be desperate to get after that.