I picked up a MC21 locally in San Francisco for $2500.00. Bike runs great, looked much cleaner then that one, and was an SE model. Wasn't reg'd, but that wasn't what I wanted (to be used for racing).

The bike you are looking at buying looks like it's had a hard life, and has been peiced together to create a complete bike. The front cowling looks like it came off an RVF400, the bike over all looks very rough. The mileage is saying it's ready for a crank.

I am not sure how much work you are looking to do, or how much you are willing to put into it, but I would say you should wait, find on in better condition that may be more to purchase, but wont need as much to get it into decent condition. They are out there, just need to hold out, and keep searching.
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Charles Gallant