@trip6
Just to put your statement into scale: to break into a safe w/ 20 feet walls, you need what? a month?
To break an AES-256 key using every piece of hardware on this planet, you'd need several times longer than the current age of the universe (actually you're not even beginning to get to the same scale here), using much, much more power than the universe has got - and yes, I have converted all matter to energy for that purpose...
So, with today's technology you can safely assume AES-256 or RC5-256 (or even 128 bit keys) to be secure. This may rapidly change once reasonably sized quantum computers become available, but that'll take a bit.
PS: The still commonly used RC4 encryption has some weaknesses (e.g. in WEP), so it must be carefully implemented and use appropriate key lengths. E.g. WPA can still be considered secure whereas WEP is highly compromised. WPA2 (optionally) uses AES, so it's the best choice for wireless LAN encryption.
