Have you looked at Eureka's SEALS? I suspect they are pretty much ideal. It's rumoured that the sculptor is working on some more figures for the range. They fit well with Empress size wise. Much as I love the Empress sculpts, I feel the Eureka one's have better posing.
If you want to trick out your SEALS then Eureka sell a separate pack of pouches, water bootles for their superb Modern French, great for adding variety with chest rigs etc.