Given your all up crew weight, I think the Hurricane would be the best bet.

Hawk is no longer made, it was the first one of the F18's. 

I'd go for a Hurricane with the SX kit; or maybe one of the other 20 footers like the Nacra Inter 20. 

All the spinny cats are pretty much the same to rig, infact the hawk is probably a bit more fiddly than the inter20. Go for the 20 super boat - easier to sail than an 18 - nice light mast too - spares easy to get.

All the Spi cats are rigged the same way.

For 4K you can get a very good 5.9; Just make sure it has the newer bendy mast.

I would suggest you talk to Andy Webb.

Hurricane 5.9 website for sale list

http://www.hurricane59.com/forsale.php?id=forsale - http://www.hurricane59.com/forsale.php?id=forsale

The Hawk was very well built and you will still get parts from White Formula.
The main problem is that they did not have a chute, and unless the one you are looking at has had one fitted, it can become quite costly to bring it up to date. As well as the chute, you will need patches on the spinnaker - and the early spinnakers were not great anyway - so you could need a new one - It can all add up. 

Exactly, and you will be buying a boat with obsolete sails, I'd say buy a Hurricane SX, it will hold it's value too.

I sailed the Hawk against Hurricanes for about 6 years, before I got the Spitfire. Some of the Hurricanes in those days had spinnakers, but not the SX kit, which performs really well and looks good also.
Upwind the Hawk had the same speed, but pointed higher because of its daggerboards - especially as the wind strength rose. I think that it feels more responsive than the Hurricane - which seems to get into a grove and just drive along. (I have only sailed the Hurricane a few times). Because most of the Hurricanes did not have spinnakers then, we almost always beat them downwind. Having sailed against Tigers, (but not on one) I always felt that the Hawk was more forgiving. Many times I have seen Tigers pitchpoling close to me when I felt completely in control. The Hawk was not developed, because Laser (and Reg) did not think that, financially, it was worthwhile getting into a war with Hobie.
I still think that an upgraded Hawk is a very good buy at that price, and a very cheap way of getting into F18.
I would also say that if there is a Hurricane fleet at a Club near you, it is always best to sail the same cat as those around you. You will learn quicker.
You probably are a bit heavy for the Spitfire. 

P.S. There are still many Hawks in the UK and Holland. You can still get sails.

War was with the Hobie Tiger.  The traditional Laser boats are all one designs, the Hawk fitted into the F18 rules and the F18 box rule has taken off big time.  IMO Laser did not want to get into a "development" class and be forced to constantly pump more money (and time) into the design/development process.

Agree withSimon, Hobie were paying top sailors to sail the Tiger and Laser were not prepared to  do same.
PY for Hawk is same as Hurricane 5.9 - 691

Congrats on your F18 purchase.....  DOn't be too worried about your weight, we are racing a Capricorn at 170....  We have trimmed dwon from 184.

Off the breeze in the light winds, the weight can hurt you a bit, but as the wind increases, your disadvantage reduces.

Also, if you are in the need of a good holiday, then Yeppoon Queesland (Australia) could be right up your alley.......  See below