Planning on going flying in the morning, actually. Managed to repair the brushless motor in my mini ultrastick...Well, appears to be repaired anyway.
The P51 mustangs would be a great first plane if you like destroying your money. P51s are touchy even for experienced fliers, you, a total beginner, would probably not even get off the ground without demolishing it. Just about everything on tradem...Err, I mean the site we are not allowed to speak of...that's described as a trainer is almost completely inappropriate as a trainer.
Electrics aren't necessarily cheaper, for anything but a small plane they're going to cost quite a bit more. You can get a good nitro engine that will easily fly a 5 foot wingspan balsa for about $200 or less. An equivalent power and endurance system using an electric will cost somewhere around $400 using the cheapest and dirtiest bits.
If you want to go electric I'd suggest something like a Multiplex Easystar. They're pretty much indestructable. www.foamworks.co.nz has them. They're an ARF(Almost Ready to Fly) so you'll need to buy your own radio gear to install in it, batteries and charger. Once you're experienced to upgrade you can move the gear to your new plane.
If you're willing to accept a nitro plane do a search on the T word site for "AT40 rtf combo" it's got almost everything you'd need to start off.
And if you do get a plane, go to your local club, get someone there to fly it and trim it. Even for someone with experience flying a new, out of trim plane can get a bit terrifying...