Really a personal preference thing. Some swear by their Gefells, others not so much (same being true of most other brands). I think it is hard to beat the AKG line for the combo of quality and value.
FWIW I ran Gefell hypers for a month and really did not like them. Quality of the build was outstanding, just sound-wise it didn't work for me with the combo of gear I had. I've run a lot of different brands of gear, including AKGs (though not the CKx line) but even having said that, it's a little hard for anyone to tell someone else what to get when they don't know their ears or their source material.
For stealthing, can't hurt to start with AKGs. They're a well-respected brand, the quality is good, and if you hate them, they're easy to unload because tons of people have them and they're a good value. Gefells are a bit more of a "specialty" product.
IMHO neither of them are as good as the Milabs you already own, but....