It's because 1080p is 16x9 and is pretty much the standard now. You can search on newegg by res but you really won't find much that is not 16x9. I'd just suggest you going up to a 1600x900 or 1920x1080.
I don't think 1600 x 900 is going to cut it either. Still 20% less depth than my current. And for that resolution with HP I would have to be looking around the $2-3k price range.
Haven't seen anything in a 15.x inch size with 1920 x 1080 - can you suggest some brands/models?
My budget is under $2k (Australian prices). I'm not playing down the shallow $350-$400 end of the pool.