I wall mounted my 42" plasma with a fixed bracket off ebay, never had any need to tilt it.... Doesn't seem to sit out too much, and anyway you need a little bit of room in case you want to fiddle with a cable or something. You can see this here:
All cables run down between bricks and plasterboard... just wish I had the foresight to have run an HDMI lead in when I did it... doh! So, it's staying scart only until I decide to revisit the flooring (which means taking the fireplace out for easier access to my cable route.
If your plasterboard is timberframed then I think you can probably use the batons for a good enough bracket fix. Mine is a brick/block built house and the plasterboard on outer walls is via that 'dab of goo' method with no batons... so I needed to get some decent anchor bolts to go right through to the blocks. Seems fine to me and is solid. I tried to swing off it myself before putting the TV on it.
You can see the anchor bolts in this pick:
Unless you are siting your screen in the corner of the room then I'm not convinced you need a bracket that will adjust horizontally. I mean a display that is 40/42" wide with even a slight angle on it means that either the left or right side is gonna stick way out... which may be OK in the corner but could look a bit off in the middle of a wall.
Andy