There are many factors that effect GPS accuracy, as you probably know after reading about GPS satellites. WAAS support (in North America) will help the accuracy, also newer chipsets usually mean higher accuracy. From the receivers I've seen, the SiRF II series chipset has performed very well in both time to fix and accuracy. Their newest addition, the III series, which won't be out in receivers for a while, will increase the accuracy even more.
For the the signal jamming by the DOD, ionospheric disturbances, satellite orbit errors and other spatial or technical data degradations, the WAAS, EGNOS and future MSAS will help in this area tremendously.
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