Create a public address and watch it. For example look at:
http://blockchain.info/address/148KkS2vgVi4VzUi4JcKzM2PMaMVPi3nnqYou can send BTC to the public address and verify the amount. But only if you have the private key associated with the wallet.dat file can you retrieve the BTC.
Restoring it is easy, just install the bitcoin client and replace the wallet.dat with your existing wallet.dat - Just be sure to keep multiple secure back-ups.
Also I would highly recommend Armory - bitcoinarmory.com - very well trusted in the community. I met those guys at the bitcoin conference and they are very reputable!