Yamaha CS80

Hi guys, 

For a number of years ive been hanging onto some cs80 parts, basically i 
want to be able to keep mine running and always have parts in the event of 
it needing a fix. 

So at the moment i have: 

4 voice cards
2 trg boards (each with 24 IG vca's)
1 tck board
2 kbc boards
1 sub board
1 sh board
1 pra board 

However there is something id really like to buy and i im considering 
selling some of these boards to help fund that. 

My question to the Cs80 experts, what in your opinion should i keep- i want 
to keep enough to make sure my unit is ok for the future, but not keep to 
much just for the sake of having it if you understand what i mean. 

I was thinking of selling 2 voice card, 1 kbc board and 1 trg board and 
keeping the rest.
I am mindfull of the fact that cs80 parts are hard to source and the days of 
cheap cs50's and cs60's for part donors is long gone.. those things go for 
big money these days. 

I guess if anyone is specifically looking for any parts perhaps PM- please 
be aware though that they wont be going cheap! 

Cheers,
Rob.