The 1000 is older than any other. My 2000 is scheduled for a recap even so it's a good idea, at least it wont hurt.
A politician's answer there!
A quick Google shows very little info an recapping an A1000. The 600,1200 and 4000 haves surface mounted caps that cause problems whereas 1000 doesn't. Probably no harm in getting them done but not sure it's necessary.
