Establishing new key - key setup recommendations

[Thomas Harning Jr.]

I've generated and published a 8192-bit non-expiring RSA 'master' key
for signing other keys as well as 2048-bit RSA keys for signing and
encryption (expiring in a few years).  The master key is protected by

I have not had it signed by other users yet and am concerned that I
might want to generate a new keyset before I get the 8192-bit key in
wide circulation.  I have, however, signed tags in my Git source
repository with a subkey... so would it make sense to migrate those
subkeys (through trickery i've seen)... or would the fact that they
are available under the 8192-bit key be a general problem?

Some options I am considering after reading blogs/etc:
 * Generate RSA 4096-bit master signing key and revoke the 8192-bit
key noting that it has been superceded
 * Generate DSA 3072-bit master signing key and revoke... (this is
well supported, right?)
 * Wait for ECC to be in standard and supported by PGP and GnuPG
 * Generate ECC key and keep it alongside my better-supported 8192-bit
key until better software support arrives (perhaps keeping both
well-signed?)
  - this implies the ECC public key storage for signing it has been
set in stone...

Any help in this decision would be well appreciated.
-- 
Thomas Harning Jr.