I'm not sure if these are exactly what your looking for, but give them a try...
Chrono Crusade
Apothecarius Argentum??
Sengoku Strays
Maybe some characters in Kateikyoushi Hitman Reborn!
Zanbara!

Sorry if they don't fit your wanted description. ;~;

I third 1/2 Prince!

Baccano! (Novel) has a lot of deadly bishies. The anime is great, but I haven't read the manga.

Durarara!! (Novel) - same.

D.Gray-man though he's actually cute...there's tons of other guys that fight and i don't really know what to consider his weapon

Heart no Kuni no Alice literally nothing but bishies. mostly guns but there are swords too

kuroshitsuji although i haven't read much, the butler seems to use w/e's on hand to fight and i don't think that anyone will disagree that he's a bishie <3

zombie loan has a supernatural element to it

there's tons more but i can't seem to remember any...

Adekan stars my favorite deadly bishie. That babe is SEX INCARNATE. *_____*

Also Yama Fu-Tang, if cross-dressing boys of incredible beauty and deadly skill are your thing...

Hei from Darker than Black and Darker than Black: Shikkoku no Hana.
I haven't read the manga for the first one but the anime was really good !

You were absolutely right, HE IS ONE!
This has gotta be one of the best ones evarr! XD

Darker than black is one of my favorite anime series and Hei is totally hot.
No surprises there.

Though Zanbara! has also caught my eye, I'll be checkin up on that real soon!
Yay.

noblesse!