Why just those model years? Don't care for the 03-05 models? Anyway I know the earlier models you mentioned had some problems but nothing too major, I think minor recalls maybe someone else can confirm that. The only major one was floor corrosion recall in that apparently the ECHO's floor rusted away earlier than it should, so I went in for the free installation that helps delay that corrosion.
I have an 03 ECHO sedan and I love it! I preferr the styling to the previous models but each to his/her own. I can tell you this...the ECHO is the cheapest or one of the cheapest cars to maintain on the road today. If you're looking for A to B basic transportation with great gas mileage and Toyota reliability, look no further! It's probably the most cost effecient vehical to own today. I have an automactic and I can say for an auto I think its peppy and pulls decently, as much as I would have like the manual the auto holds its own and gets great mileage for an auto.
Well, I wish you luck! Check into the cars history like on CarFax or something just for damage title or not, that's important. Keep us posted!