i would assume he meant for you to do a side-by-side comparison of the 'features' on the perspective receivers, and make sure you are getting the best "bang for your buck". in other words: DSP features, 5.1-6.1-7.1, DTS, Dolby digital, Pro LogicIIx, auto calibration, variable crossover settings, input up-conversion, pre/pro capabilities, SACD inputs, overall wattage, etc. those are the kinds of things you need to concentrate on.. well, those and a few others.
also, make sure the receiver has the proper amount of inputs you are gonna need. optical/digital/s-video, component, regular coaxial, phono, etc.. those will make a big difference in how you will be able to set the whole system up..
good luck, and try not to get overwhelmed.
bigjohn
