I predominately race solo on a Stealth F16 but have also been able to take out my friends 2005 Auz Flyer. I'm a bit lighter than you at 168lbs but have found that nothing (almost) is better than sailing an 'A' upwind, you just wont stop smiling or being amazed at your speed. On the other side of the coin, taking a F16 downwind solo can also be very exciting. However, you only tend to start smiling when the kite is back in it's snuffer and you're rounding the leeward mark.
I have always raced boats with kites so buying a F16 made sense to me but if your background is Lasers and the like then you wouldn't really miss one. Both UK F16 & 'A' Fleets are quite small and this makes for a really friendly after sail session.
There are a few second hand F16's & 'A's on the market all relatively new, but not meaning to be rude given your weight I think you are more suited to the 'A'. Send me a PM if you want more details of 'A's or F16's which are for sale. (I'm going skiing tomorrow so I wont be replying for a little while)