Hi SB,
If you want to buy some new Monster you should buy the M1000DS for the little price difference.
It has more horse power, much more torque, a dual spark engine and so on. Imagine the 620ie a woman and the 1000 a man, so the 800 will be what, a transexual?
A horse power diagram of the new 1000 engine has been done by a german and a french magazine and both came around 97HP without any engine modifications. The strongest 2 valve Ducati ever made! It has just little less torque than the S4 (4Valve), and a Ducati should be driven on torque and not on HP.
The M1000DS is about 1.000$ more. You will get this money back the day when you sell it.
The 1000DS is in my eyes the only option with a 2 valve twin cylinder engine. 4 valve engine, naturally the engine of the 996 in the S4R.
Marc620ieDarkness