What to use for secure bitcoin client machine/wallet (non-miner)??

[m0w3r]

What would people recommend for a moderate cost bitcoin client machine now? 
This would only be used for a secure bitcoin wallet/client.  No mining, not a general PC, not even web surfing, probably mostly kept turned off.

I was thinking a cheaper laptop that didn't have wireless (if that's possible to find) that runs ubuntu?
Or, maybe a mac laptop?
Or, maybe an old PC/laptop that I reinstall with ubuntu, or is there a better OS to use?
Or, some kind of linux off USB with a persistence file?
Or, some more specialized hardware device that I don't know about?

Does anyone have something setup that they really like for this purpose?

[wumpus]

I'd recommend buying some cheap netbook, and slapping Linux (whatever distrib you want) on it.

Wireless can easily be disabled if you don't want it (either by blocking the driver, turning off the switch, or ripping out the wifi module...)

[drgr33n]

LinuxCoin  https://bitcointalk.org/index.php?topic=7374.0

[InstaGx]

If you only need the client once in a while you could run a node on your pc to keep up with the blockchain. Then when you actually need to make a transaction you could copy the blockchain to another machine (e.g. a notebook you only boot for bitcoin) and manage your wallet that way.

Remember: You don't need the client to receive BTC and you don't need it either to check for your balance. You could bookmark your addresses on blockexplorer in your browser for example.