For me: The Vacancy
A great, sexy, fun to use Omolon fusion rifle sold by the FWC in year 2. That range, that impact, that sound.
I hope there'll be a similar fusion rifle in D2.
Edit: Changed title to weapon because swords.
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Don't laugh when I say Ace of Spades. I'm a headshot crazy Hunter who likes to fight armies of Thrall and Taken Psions single-handedly, and we all know that reloading is when Adds like to go in for the kill, and by the time you finish, there are twenty more freaking Taken Psions to replace the nine you just killed. I bet the guys I killed in Crucible laughed too when they say I killed them with the Ace.