Yeah - before you really get invested in the texture you should really nail down those UVs and get every pixel you can out of it. I'm sure someone around here must have an example. I, for one, do not :( Seriously, you'll kick yourself further down the track when you realise that you could've done it 10% better! Do it!
Now you are getting there mate, UVs get super easy once you understand the basics, once you have the basics down you can then afford to spend time on them working out things like pixel density etc. For now though just keep practicing unwrapping stuff. If you want some more models to practice with take a look in the SDK…