A 700p on EVDO is definitely faster than 650 on 1x RTT. It's more usable for replication of PIM data, web surfing, etc.
In my tests, EVDO offered up to three times the speed performance on download and up to twice the speed for upload.
EVDO Boost mode provides faster upload speeds at expense of slightly slower download speed
PDANet Rocks! However, no noticeable performance benefit with EVDO Boost or Proxy Mode
Here's a copy of my test results 20061004_Treo_1xRTT_vs_EVDO.pdf