Ferrous hull comments aside, below is a good write-up on the pros & cons of sloops & ketches. http://sailing.about.com/od/typesofs...Vs-Ketch_4.htm
With a 65ft boat, you will no doubt need some help hoisting & winching up both the main & foresails (jib, staysail). For a boat of this size they will very likely be too heavy for one person to hoist. Moreover, you'll need a physically fit, well trained crew to handle it well in various sea conditions.
The only exception is if you rig out the boat for single handed sailing. If you had all lines routed to the cockpit and some high quality 3 speed winches, that would make life easier, but only for a sloop rig with a self-furling jib. All other rigs would require you leave the cockpit to tend to business.
If I were you I would take Pars advice and start with a smaller boat. I would suggest a sloop in the size range of 25 to 40ft. The larger the boat & corresponding sail area, the more difficult to hoist/winch.