afraid the prices you quoted seem terribly low....and therefore "far too reasonable" if you know what I mean...are you talking Oz dollars or US dollars...either way I tend to be suspicious of anything that sounds far too good to be true.
Over many years experience I have found that the more expensive machines put out under the manufacturers own name to be the best for a host of reasons. Positively the best autos are built by JURA and by best I am talking ease of, "feel" and quality of use, expected service life with little problem, ease and availability of service and parts, and not necessary quality of coffee where with autos, they all generally seem to put out an equivalent sort of brew ( except that with some models it is much easier than with others to change strength / quality of brew).
Unfortunately, the cost of the most basic Jura is far in excess of those quoted by you for the gaggia machines on ebay, starting at $1895.00 and "only" one thermoblock, but remember.....you invariably get what you pay for.
A very good budget auto is the Spidem Trevi "Digital" / "Exclusive". It is a 2 thermoblock machine so it is easier / quicker to go from coffee making to production of steam, and back without necessity to purge steam out of the system first. As far as I know this would be the cheapest good quality 2 thermoblock machine in the market at $1390.00 for the Exclusive and $1490.00 for the Digital, and the nearest other brand 2 "boiler" would be up around the 2 thou mark. Also....it is far more reliable in long term use than many other machines around the same price.....!!!!!
Please believe me when I tell you, that whilst the coffee produced is usually of a certain equivalent standard for an automatic machine, the cheaper single thermoblock/boiler auto espresso machines are very light, flimsy, plastickie, easily damaged, hard to work around, cramped, cheap coffee machines.
Auto espresso machines certainly have their place and are extremely convenient to use particularly in the office environment however if you are not so constrained by budget, you will get much better by trying to get into more upmarket models.
Apologies if this isnt precicely what was asked.