Quoted:
all the Icom 706 units that I find are in fact the IIG models (which is mho siemens dollahs)
You can find them, but they are a little harder than the MkIIg. There were more of the later models made, but it seems people tend to keep the 706 more than the others. It is funny since the 706 only has 10 watts on 2 meters, and no 70cm. The MkIIg is superior on RX with the DSP and is an all band unit, but it does suffer on RX of AM, and one of the common mods is to replace the factory filter with that of the 706.
I got lucky with mine, and picked it up cheap off of craigslist. The nice thing was I was able to demo the unit on the air at the guys QTH.
I love my 706, it is not the end all be all of radio's. It has a good receiver but it does have a wide front end, and it is a little noisy. The receiver on my TS-520s is better than my 706, but it is also 10 times larger and heavier.
I own 2 HF rigs, the Icom 706 and the Kenwood TS-520S, both are budget rigs, and both work very well. I would recommend either one.