Hinderer Investigator (in Copper for me, but also available in Ti, Stainless, Brass or Al). It's beautifully machined, wonderfully weighted (varies by material, of course), uses a fisher cartridge (ships with a Bold, I think, I swap everything for Fine) and has a cap so it won't accidentally deploy and ink my pocket like my Fisher Shuttle edition keeps doing. It's 4.25" closed, but open and with the cap on the back it comes in right at 4.5" (an open fisher bullet is 5.25" by comparison).
Just go ahead and order the flat end with it. Personally, I think it looks better, but the pen is a little short (IMHO) to really be used tactically and I want to be able to fly with it without thinking.
I also love my county comm embassy (this one god awfully expensive in copper), but it weighs in at just over 1/4 lbs (4.23 oz) with cap so I can't quite bring myself to EDC it.