An Atlanta would be a good mother ship for a fleet of smaller go-fasts and would do a fine job of NGFS for those pesky pirate shore hide outs.
Personally, I say bring back the Pegasus Class. 51+ knots on foils, a 76mm mount and 8 harpoons. N-A-S-T-Y.
Slightly rough on your fuel budget though, turbines arent known for their high MPG rating.