How far, how much?

I have the following 2 channel rig:

Rega Mira Integrated amplifier
Onkyo DX-7555 cdp
Mid-range Audioquest interconnects and speaker cable
Infinity Beta 40 speakers

It would appear that the Beta 40's are the weak link here, although I must say that they don't sound bad for inexpensive speakers. Actually, they sound quite decent -- surprisingly neutral. But I do feel like I am missing something.

I like the sound of the Mira and the Onkyo, and I plan to keep them for now. My room is 13x16, and does double duty as the living room, and I've got HT gear as well (though the audio path is direct CDP => Mira => Loudspeakers).

My question is: Given my current rig, how much should I look to spend to achieve a true step up in loudspeakers? I am partial to floorstanders, so I have been considering PSB Synchrony One, Revel F12 (which may be similar to my Betas), or Monitor Audio RS6. Any other suggestions in this range?
You are going to have to give us more info as to your likes vs dislikes. Are you looking for something a little laid back or right in your face. Do you like big bass or sacrifice some bottom to get a smaller, tighter package. Do you want new with a warrantee? There are lots of speakers out there, so think about what is important to you. It is a big investment.
Excellent info Para for who what Im not sure.Could you be a little more vague?Cool,Bob
sounds like you're in the 1k range--the monitor rs6 is the giant killer at that price (also the larger rs8, which you should find used for a grand). i'm also partial to the von schweikert vr2, which is easily available used for $1200-1300 or used jmlab focal cobalt.
You did not ask but I think your CDP is the weaker link and will readily show that with higher res speakers.
PSB are excellent but the CD player is average. No speakers can improve the source. Rega makes very good inexpensive cd players.