Ok, finally I've bought an M2732 FullHD LG. The bad is that it only has 1 HDMI (Edit: I've just bought an HDMI switch), but the good is how good the Indi works here. Booting my AmiKit conversion it shows almost all the booting image it has, and later you can see all the HighGFX screen centered almost perfect.
I noticed I was having some horizontal lines (don't know if the same ones that I was having in the past), but it was just to press the connection between the indi and the Kipper2k Hdmi cable adapter and they disappeared.
Before, with a Samsung 24"Led Tv I had to change with the remote to Ext (scart) to see some screens, but now with this Lg I can see all of them through HDMI, so now I can play games and they are shown to the right of the screen, but complete.