170 = fun
I am very satisfied with the 170.  I had purchased it to sail with my wife or daughter as second mate, but recently they decided they preferred to do other things, so I have gone out alone exclusively.  I bought the 170 in the spring of 1998, when the boat was a new model.  Hunter has since replaced the rudder with a new, better one.  Sailing the boat is just great.  I sail on Candlewood Lake in Connecticut, north of Danbury.  It is very difficult sailing, usually, because mountains surround the lake.  As a result, gusts of wind are frequent, and the wind direction often changes in a gust by as much as 45 degrees.  Nevertheless, I have not yet tipped over with the 170.  It doesn't seem to want to tip over, thank goodness.  Maybe it is its wide beam.  One very minor addition I made this summer was to extend the length of the line to the roller furling jib.  With that modification, I can easily furl the jib when I see a nasty gust of wind coming.  It has worked like a charm.  I now sail single-handedly in whitecaps without problem, though some extra weight from a crew member on the rail would be nice at times.  I find in strong winds I sit on the rail, rather than on the benches.  That way I can take more wind without heeling too much.  Because I sit on the rail, I would think that cushions would be a waste of money, and actually a bother on board.I have the boat docked for the summer so all I have to do is pull up the sail and off I go.  If you plan to dock or moor the boat when not in use, I would order the sail cover if you get the boat.  It's about $150 but well worth it if you ever plan to dock or moor the boat.  The sail cover would be silly if you trailer the boat all the time.  Trailer is fine.  Strong steady.  It has a mast support at the front too.  However, I use it minimally since I launch the boat in April and retrieve it in September.I would say a motor is necessary.  It's much easier to launch, unlaunch, moor and dock.  I have a Yamaha 3.5 which is very adequate.  Don't need anything bigger.  Might be able to get by with a smaller motor.  Get the motor mount, even if you don't buy a motor immediately.  Harder to add later.I really do like the 170.  It's nice that no water can stay in the boat due to the open transom.  And it works whether the boat is in the water or in your driveway!  However, when the boat is docked, and I am trying to get out, water comes in from motorboat wakes, or if it's wavy and I go in reverse with the motor.  So, barefoot sailing is sometimes best.  No water comes in when I sail, though, unless the wind dies and the motorboats don't.Improvements I am thinking of making are minor.  I'd like to extend the jib sheets and have each one a different color.  For single handed sailing, tacking or jibing is tough when it's hard to pick out the right rope to pull in a hurry.Best of luck