I've had good luck with HS485HB as well as HS605BB and Futaba S3152, S9202 and S9001 servos on my gas models - float and otherwise. Years back my R/C mentor told me to avoid metal gear servos in fixed wing aircraft (I think from the 72MHz interference potential) and I just never got into them since.

No failures yet. And no glitches, either. ;-)

Note that the 5496 you list is best powered wih a 2S 7.4v Lipo flight battery. You don't want to try that with the other two HS servos without a regulator to drop it to 6v.