Whether its worth investing in an ASIC miner completely depends on what Bitcoin's value will be over the duration of your mining 'career'. In my own personal opinion the Bitcoin mining ship has sailed. If you're interested in mining I would recommend using the money you plan to spend on an ASIC to invest in a Litecoin mining rig. With the difficulty pretty much set to double / triple for Bitcoin mining over the next few months (if Butterfly Labs actually ship any of their large rigs, and with people building their own Avalon rigs) Litecoin would be a safer bet - but not by much, given the fact that GPU miners will likely switch to mining Litecoin when Bitcoin's difficulty gets too high to mine profitably due to ASIC's kicking in. Most importantly, do your research. Check out the bitcointalk.org forum for likeminded folk and see what their collective opinion is on mining at this stage in the game. Libertas