I'm over-thinking

this I know, but mesmerized by the many Speaker,AVR options.
Because of the lack of money, I was going to settle on a Sony THiab, only to be told to stay away from Sony,Yamaha, and Panasonic, and even Bose by numerous people.. Well, there goes my small budget thinking theory right out the door.
Bottom Line, I want to hang the TV on the wall,and I have only one HDMI cable waiting for it. I'd hate to remove to hook up another cable. I guess this depends on which way to go on the hookups. I'm still looking at AVR's comparably to HTiab units.
I've been told to spend a little more than the THiab units for something like the OnkyoSR606, along with these polk speakers...
2)Polk Audio PLK M10 2-way bookshelf, 89db
2)PLK M20 (amp power recom,20-150w) or M50 Floor monitor,
1)PLK Center CS10,and
1)PSW Sub 10" (8ohm all nominal impedance)
This 5.1 set up, which would cost about $670.00+tax.,(amazon) OR maybe a HTiab like the Onkyo HTS5100 with included speakers,but they don't look like they would sound like anything special.
I thought that the lower ohms, the clearer,brighter sound..are most entry level sound 8ohms?
HTiab is more pocketbook friendly than the component setup, I do realize I'd have to spend upwards of $2,000 for a above average sound system,but I just don't have,nor ever will have that kind of money.
What to do? Does anyone have any above mentioned Polk speakers,or can you recommend something else, and the same with the A/V receiver....should I stay the course with Onkyo?
My set up will ONLY be as follows...
Samsung 46" A750 (I have now)
TimeWarner HD-DVR Box (I have now)
Sony BluRay 350 (will get soon)
and whatever receiver/speakers I end up with.
I'm thinking this...
1 HDMI Time-WarnerHD-DVR Cable box to Receiver,
1 HDMI Blue ray to Receiver,
1 HDMI)Receiver to TV (TV's hdmi out to receiver hdmi IN)
And no optical from tV to receiver.
My room is only a 12' x 9', so I do want a decent system without breaking the bank or breaking the sound barrier. Thanks!