Depending on scale and preference lots of options out there. The old board game Ironclads and its' expansion port perfectly to miniatures at 1/2400 but be can also run on hex gridded mats with 3" hexes in 1/1200 or larger at 1/600.
Other quite common rules for the period are "Hammerin Iron", "Iron and "Fire", and "Smoke on the Water".
Iron and Fire is the more complex with Hammerin Iron the simplest. I find Smoke on the Water a good middle ground.
Here is a link to a discussion on just that topic.
http://theminiaturespage.com/boards/msg.mv?id=305214