Another agreement from me on the Maxell XL-II-s tapes.
Also, the mid-80's TDK SA/SA-X and the Sony UCX (metallic purple label) are great performers for CrO2 types.
Metal tapes of choice here are the TDK-MA-X & MA-XG.
Normal tapes I like the TDK AD-X, the Sony BHF and the Maxell-UD.