Advice on a Used speaker, Budget $4500


I just sold some of my speakers to thin the heard and try to step up to a better speaker.  I sold Kappa 9s, Dunlavy SCIVs, and Infinity QLS1s.  All of these were very good but I did not use them much.  In my mind I want to get either a Dunlavy IVa or V.  I am looking for a good all around speaker that does it all well, I know some speakers can do certain things better, but lack in other areas.  That is why I want the V's,  it is well known to do it all well.  It is supposed to have a nice balance.  The only thing that worries about the V, is some people say it takes allot of power and I may not have the amp for it.  I sold the IV's due to the lack of bass.  I know my room was part of the bass issue and I am in the process of having a professional help me get my room dialed in.  I listen to all music, but if I had to choose a preference it would be classic rock and blues rock.  I do love crisp vocals and if I had to pick a favorite instrument to listen to it would be the piano.  I know I like classic rock but then list the piano,  go figure.  By the way my room is very big around 500 sqft and has 8ft ceilings.  It is a basement man cave that my wife lets me do what I want with.

Here is some of the equipment I can use to power my speakers.
two Mcshaned Citation IIs
Two Mcintosh MC30s
A sumo nine
a Pass labs X250
Citation I preamp
Juicy Music Blueberry
The Dude pramp
Pass Labs X one

As you can see I have a variety of choices to work with because each speakers likes something different and it is fun to experiment with.
I would love to hear some opinions on what to look at.
robmag
ProAc studio 148s new. Great 2.5 way narrow tower speaker that goes deep with its flexible placement downward firing port. Many say the ProAc studio 125s get the classic rock midrange so right. I had a used set of 125s in my room while my 148s were being shipped and I think the 148s have the same great mids and highs clarity but have better bottom end. I use mine with the Soundocity SEV9 outriggers. You should be able to get the whole package for less than $3500. 
Finding a pair of used VMPS RM40 speakers would be a fine all round speaker.  They are similar sized to the Dunlavy's.  Great clarity, dynamics, soundstage and bass.  You can find them anywhere from $2200-3500 depending on the upgrades it has.  I drive them with an Edge M6 at 120 watts per channel.
Get some sc-iv A's   but figure out your room.  I have iv and V both pairs as i can't seem to bring myself to sell either.  The IV's in my room have plenty of low end. The v's are a little too much low end.  Room is 18x18 with 10 foot ceilings concrete loft.
Have shag carpet on the concrete floor and back and front walls /corners are treated.  I find the dunlavys to prefer heavy gauge wire in my system
At a $4500 price point why buy something used? Get a new pair of GoldenEar Triton 2+. In fact you may be able to persuade your dealer sell a new pair of T1s at $4500.
Dear Gods, Tritons?  What a hard and merciless treble.

Listen to them for yourself, but the only time I heard these I thought the dealer was trying to run me out of the room.

They run along with the Triangle and older Thiels for a treble with murderous intent in my book.  However, for some they may be ideal, only your ears can judge.