My domain mydomain.com is registered with godaddy. I wish to host my tumblr blog on this domain with nearlyfreespeech.net hosting.

My active nameservers at godaddy already point to my authoritative ones at NFS.net which is working. However i'm baffled of the correct configuration to set to point to my Tumblr.

Preferably id like

(A) my domain http://mydomain.com to host the blog and have http://www.mydomain.com redirect also to http://mydomain.com

If this is too difficult my next preference is

(B) to have http://www.mydomain.com host the blog whilst http://mydomain.com redirects to http://www.mydomain.com

My 3rd preference is to have

(C) a sub-domain like http://tumblr.mydomain.com or http://tumblr.mydomain.com to host the blog and i guess have http://mydomain.com and http://www.mydomain.com both redirect to it.

I've tried having two aliases mydomain.com and www.mydomain.com pointing to my permanent NFS ip at mydomain.nfshost.com and when i try to add:

(1) an A record pointing mydomain.com to the ip 66.6.44.4 as per Tumblr's instructions it tells me i already have the bare domain as an alias so i cant do that.

(2) the A record on the www.mydomain.com alias. I can do this with either www.mydomain.com set as an alias or not. But when i tried this with mydomain.com set as the canonical name the result when visiting either mydomain.com or www.mydomain.com was them both continually redirecting to eachother until an error was thrown.

So i was wondering if there is a ninja that could save me some hairpulling and tell me the correct way to config A, or else B, or else C.