It really depends on how big you are since a bigger rider will need more watts to maintain a given speed due to his larger cross sectional area and mass than a small rider. Take a look at this web site http://www.analyticcycling.com/, where it has some tools to help predict required power plus buy the book "Training and racing with a power meter" by Hunter Allen and Andrew Coggan.

lots of good info out there. as stated above. the key thing (well 2 things) is:

~ to make sure your testing correctly. so that your zones are set up as accurately as possible.

~then focus more on what YOU can do and can not do. focus on your personal improvement by taking small steep toward you goal.

if you only think about your long term, this is where i would like to be, goal you'll get very frustrated and most likly not train properly.

good luck!

no not quite.