I want to buy an acoustic guitar, something cheap to play at home. I have three options :

1) http://www.ultimate-guitar.com/reviews/acoustic_guitars/yamaha/f310/index.html
2) http://www.ultimate-guitar.com/reviews/acoustic_guitars/epiphone/dr-100/index.html
3) http://www.ultimate-guitar.com/reviews/acoustic_guitars/epiphone/aj-100/index.html

The music I play the most is : Radiohead, Beatles, Coldplay, U2, Pink Floyd, Bruce Springsteen..
What do you think ?
I'd go for the AJ-100, but I advise you to go to a store, and try out those three guitars if you haven't done that. Then you get a good idea of how they feel, sound etc.
The Yamaha is great, I can tell as I do owe one, anyway, I'd try 'em all (and maybe more) before making any decision...
I have the Yamaha aswell. I think it's a great guitar!
Farida D32E
Walden D522 12 String

Levellers <3
I think i would go for the Yamaha IMO sounds much better, but i will suggest you to go to a shop and have a look and maybe you can find some special offers or used ones with maybe solid tops for your price range(solid wood tops tend to have much richer sound than laminated tops).

sigma makes good low budget guitars(They are low end martins)

also recording king makes some nice affordable guitars
Ibanez SAS36FM
Ibanez Prestige RG2550Z
Guild D-150
Gibson Les Paul Signature T VS

Peavey Mini Colosal
H&K Tubemeister 18

Boss DD-3, NS-1, CS3, CH1, TU-3
Ibanez WD7 Wah
Vox Satchurator
Digitech RV-7