You have a great start with that well kitted out A1200.
Few years back I bought an A1200 and suffered through the misery of the "floppy shuffle", and after buying a CF kit for it as well as a networking card for it, it was a *world* of difference in terms of enjoyment.
Being able to use the CF card and grab stuff via my other network servers with the PCMCIA networking card just brought the machine to life.
AmigaKit are great to deal with and should have both items in stock.
Depending on what you want to do with the thing, the Indivision scan doublers are a big, big bonus to have as well. Being able to crank the A1200 directly to a 27" LCD is real nice.
As for the case yellowing, do a search here for "Retrobrite". Many people here have had good luck with the method of using the Retrobrite technique on Amigas.
Check this link as well -
http://retr0bright.wikispaces.com/
