Whats the weakest point of my setup?

I would opt for better front speakers. Probably in the RTi line. Your center would still match with the RTi's. How high up you can go in the RTi line depends on your budget of course.
Your receiver would push those just fine in your small room and possibly after you move. Upgrade the receiver later if need be. Sell the 70's to put toward a receiver and pull the trigge on a receiver after you move.
Edited by XStanleyX - 12/23/12 at 11:12am

Look into room treatment before anything else......best improvement you can do for the money IMO.

You don't say what your AVR is so your question is the proverbial "Pig in a poke".

However, electronics can be a very poor place to invest as compared to speakers and room acoustics.

In actual experiments people have exchanged the speaker systems between two rooms and found that the characteristic sounds of the two systems tended to stay with the rooms, not so much the speakers.

It's a Denon AVR1612 per his sig.

Subwoofer.

Boy, I don't see much there that I would change except the center speaker.

All the rest looks like pretty good stuff to me, given the price range you are in.

I would suggest that you get the Polk CSi A4 center speaker. I think that would be a good upgrade.

To do much more, you would be talking new speakers and receiver to the tune of $2000 or more.

The Denon is the weak link in that setup. Improve your source, then down the road you could upgrade sub and speakers. Give a listen to some other brands of receiver, and if you have the budget check out separates.

You need a good sub-woofer. Nearly all consumer speakers just don't have the displacement needed to play cleanly at subjectively realistic sound levels when fed full-range signals.

Probably placement after that - a good starting point for main speakers is the greater of four feet and half the distance to the listener from the front wall. More than 1130 / 4 / sub-woofer cross-over feet out is needed to avoid the SBIR null (ex: 1130 / 4 / 80Hz = 3.5' which you might round up to five feet).

A few feet from side-walls is good, five feet is better. The listener just far enough away to get out of the drivers' near field for proper integratation (an 8' equallateral triangle is often a good starting point) and at least 4' off the back-wall is good. Minor adjustments fore/aft and left/right will make a big difference in what you here of your standing waves.

Speakers would be next.

To put numbers on the question

Fronts - Polk Monitor 70 - Four 6 1/2-inch woofers

Freq,Hz Max SPL, DB

10 79
20 91
30 98
40 103
50 107
60 110
70 113
80 115
90 117
100 119
110 121
120 122
130 124
140 125
150 126
160 127
170 128

On balance, one of the most bass-capable full-range speakers I've run this calculation on so far. Their 90 dB SPL @ 20 Hz undistorted capability brings no joy for a high performance system, but it is in the same range as a mid-grade (not SOTA) 12" subwoofer. Subwoofer(s) still recommended but set your sights quite a bit higher than whatever is selling for under $200 at Newegg. ;-)