I don't know, maybe it's just me, but I've always been into more muscular women than your standard anime female archetypes (the overly busty ones, the 'spunky' ones, the creepy loli stuff, etc). A big, powerful, buff babe who can get the job done.
The following is a list of ones I can think of off the top of my head. I'm always looking for more, of course. Suggestions would be appreciated.
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Reiko Ando: Outlaw Star
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Valmet: Jormungand
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Iron Virgin Jun: Iron Virgin Jun
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Violence Jack: Rikki
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Jun Fudou/Hunter J: Devil Lady (Go Nagai seems to do a lot of this type)
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Genie: Rune Soldier