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iPod Video 5G and Etymotic ER-4P. Do any of these reduce the hiss of the MiniBox? It's pretty bad.
The 75-ohm button on the minibox-E+ should help as well as changing opamps. 4627-1 will reduce hiss. If you are going to use the ER4, you may want the warmer A version of 4627-1 than the more neutral B version. I read those etys are real bright and the B version may leave the Minibox without enough warmth for your 'phones or taste, though I can't say for sure. I use RE0, RE252, and MTPC.
AD744 will not have a lower noise floor than 8610 and probably not the same synergy with the 5g classic as the 6g.
LT1028 kind of works but it will be underpowered and will give you sine sweeps not to mention a big loss of detail compared to 8610, 744, and especially 4627-1.