Board Thread:General Discussion/@comment-108.41.181.132-20130512045644/@comment-5948039-20130917224008

You can find daemons with same max ATK and DEF and see what are their base stats.

For example:

for ATK: Sibylle the Thief (4*, 30 Spirit) 3390/9750 or Nagamitsu (Ultimate) (5*, 33) 3405/9730

for DEF: Benzaiten (4*, 27) 2930/8375

So, I'd propose for Archimedes 3400/9740 2940/8380. And change skill effect for just increases all daemons' ATK and DEF. Too much honor for 4* =)