Keep the tiller, 'cause it's there.
On a C27, it's nice to lift the tiller up out of the cockpit for the 95% of the time you're hanging out or anchored out on the boat.If you want to use an autopilot, which I sure do, the unit for the tiller is about a thousand bucks cheeaper than for a wheel.I love wheel steering. It's easier, and once you know your boat, I think the small adjustments in steering, especially to weather, can be done better than fighting a tiller as you go over each wave. Pressures on the rudder change constantly. Even if the sails are trimmed well, the rudder will kick as the boat moves over waves. (18 to 20 knot breeze and up)You will have plenty of things to spend you boat bucks on. How about a cruising spinaker or a really light drifter jib? Self tailing winches are nice, too.My 2 C27s and Newport 30 had tillers, as well as many smaller boats. I had a Catalina 38 with wheel on cable steering. I presently have a Morgan 41 with a wheel on hydraulic steering. The hydraulic is really nice, but expensive to install, I think.All the above boats have been fine to sail. I wouldn't spend the time and money to change to a wheel for the small difference it makes.