If budget is not an issue, buy more where you wan to book the 1BRs. I am finding having more points at one resort gives me much more flexibility at our home resort. IF at 7 months, we want to switch and their is availability we can. I now dream of some day booking a Grand Villa. A lot hard to do at 7 months with all our points than to be able to book it (with banking and borrowing of course) with the points and not have to worry.
200 is enough for 8-9 days for studio or 4-5 1BR. If the boss wants 1BR, we can go every 2 years OR buy another 200 as you suggested. It's a personal preference but while the 1BR is great -- to me -- it's not worth 2X the cost for a place to sleep at night. But, that's another debate all together.
Instead of the same resort, are there any other advantages for a different resort such as GFV? This would allow me to switch between the 2 resorts every other year if I wanted to stay 1BR at RIV.