It seems to me the 51% threat is very real, and there's not much we can do about it. Greed will trump common sense every time. I want to do what I can to contribute to the other 49%. I'm fully aware that the mining-for-profit ship has sailed, but I'd like to learn how to mine as well as offset the 51% as much as I could.
Anyone got any advice for a noob with good intentions?
well it depends on your wallet.
your tolerance for noise and heat.
you can get a r-box for about 70 dollars and hook it up to a pool like bitminter.com or btcguild.com
low noise low heat . good power numbers for a low-cost item.
you could get an ant miner s-1 200 gh over clocked 400 watts so heat and noise are somewhat of an issue.
it can be found under 325 with a psu included. you only need an internet cat 5/6 jack to run it.
If you want real low cost I could sell you a few ice fury sticks 2 for 25 usd free shipping to the usa 4-5 gh for 25 bucks plug them into a usb jack and point them at a pool like bit minter.