The person I would be buying them from said there isn't a plate on the back. If they are an older generation of the Sony SS-F6000's would the quality degrade much over the years?
Not really I use speakers from 1990 and they sound just as good today as they did when my parents first bought them.
First if you want any advice i suggest you give us your audio goals. (how are you planning to use these speakers, and for what purpose.)
Second what is your absolute max budget?
Third what do you have currently. (Please give us the make and model number of all the equipment you currently have.)
Those Dayton's suck in my opinion but they are $35 so you can't expect much.
My goals are for a good 3.1 setup that is better than the Sony 770 soundbar I was going to buy for $350. So my budget is around $350. I'll be doing mostly tv/movie watching and occasionally listen to some music.
I spent $230 on the Sony STR-DH550 receiver, $45 on the subwoofer, and I will spend $90 on those sony floorspeakers if I go that rout for a total of $365. The lg speakers were all free.
I went this route because with a soundbar I would never be able to upgrade. At least now I have some flexibility for the future. Also, I bought the receiver I did because I have a 4k television so it was important for my receiver to have HDMI 2.0 ports
Budget is not the total you spent, its how much you are willing to spend.
There might be better options than the Sony floorstanders.
You need to keep in mind that matching centers are important speakers for the front left and right so your NEED to consider the cost of a matching center when looking at front left and right speakers.
You are going to smart route but don't jump on something without looking at the big picture.
I guess I should of said my budget was $350 but now I have already spent $275 on a sub and receiver. My remaining budget is $350-275= $75 which I need to buy two front speakers and a center speaker. (kind of impossible)
I do have the front and center speakers from that lg home theater in a box set I mentioned above that I can use in the meantime.
Set up #1: EMP e5ti, e5Ci, and EMP e5Bi surrounds, Outlaw LFM1 Plus sub, EMP 10i10i sub
Set up #2: Def Tech SM450, CLR2002, SLS Qline surrounds and Klipsch 12wD sub
Set up #3: Philharmonics- BMR in a 2.0 system, music only