small speaker for office

I'm thinking about EPOs 3, Silverline Minuet, ERA D4, room size is aprox. 15x18, using NAD 7155. My budget is $400 max. Listening to rock, blues, acoustic, of the three, the best or other suggestions. Will be bought unheard. Any thoughts??
Like the Epos. There is a pair of Celestion SL600s i saw on here...did not check price. Amazing speakers. If in good shape, i would go for it. once upon a time, a well regarded speaker by many an audiophile for its smooth midrange, musical (SF-like) nature. Hard to beat if you can find it within your budget (achievable given depreciation?) good luck!
If you are considering EPOS, the EPOS ELS 8 is available for $250 (orig $500) new from the Needle Doctor. Better speaker than the Epos ELS 3.

I would also consider the Energy RC10 for $300 (orig $600) new from Vanns.

Very happy with Era 4 in similar situation.
One more option to think about.

Tannoy Mercury V1 -- $320 a pair

Really a fun little speaker that sounds pretty dang good for it's price point.

**** Tannoy dealer disclaimer ****

Goldprint Audio
I've used Silverline Minuets in my office and can recommend them -- excellent and amazingly full sounding. Surprisingly, the Cambridge Audio S30 is not far behind, and for a fraction of the price. A great deal new and a true bargain used.
+1 for Era D4's. Astonishing bass response, accuracy for a small speaker. Love the heft when you pick them up.
I am on a similar search, although I would like a decent sensitivity so I can go tubes if I get there and willing to spend a bit more if I have to.

I agree that tannoy mercury are good, got my parents some m2 way back and they love them and I had m4 in main system for a while, very good stuff.
Consider Renaissance Audio(Morel)Piccolo. I doubt you will find better drivers in a small speaker for around $700.
PSB are gear and music friendly. If your musical tastes are more specific, I'd reconsider. But, if you need a speaker that can sound good across the board of musical genres and are budget limited, they are easy to live with.
I also like Totem speakers. Very good bass among other traits.
Making a BIG mistake if you don't consider the little 3/5 variations from Spendor, Harbeth and ATC.
I also use the ERA D4s in my office. I have gone through several amps, but the ERAs are keepers.
room size is aprox. 15x18,
if you are thinking of a pair of mini boxes for that size room why not go for a Used pair of Vandersteen 1 C would take up about the same space and
offer a fuller satisfying balance.