I think getting a T1 is the right way to go if bandwidth is not an issue and reliability is.
As for power outages, get a good UPS with a daisy chained backup. Running the machine in a cool place is a must.
I don't think there is any need to complicate matters with colocations etc, again, assuming speed and bandwidth are not issues. If speed and bandwidth are an issue and 99.99999% uptime in internet and power is a must, it is a whole new ballgame. In Chicago, I know all the right places to colocate a trading machine, but get your wallet out.
Finally, a second broker/datafeed and a backup cheap DSL line for emergencies is probably a must if you are doing your own redundancy.
nitro