After owning one of the Double Thermoblock Sunbeam machines (appliances) and now moved onto a shiny Italian machine
I'd suggest looking for one of the smaller, Italian machines.
They are built to last, built simply and will have good resale if you want a bigger machine down the track.
Dual Boiler or Heat Exchanger design probably isn't needed in your case of mostly black and a single milky drink once in a while.
The trusty Rancilio Silvia
one for sale here http://coffeesnobs.com.au/coffee-har...ia-sydney.html
And it's partner the "Rocky" Grinder are a hard to beak combo. (I have a Rocky with doser and it's a very good unit, very consitent grind and quiet compared to some)
Or something like the Lelit PL41 Lelit PL41LEM Espresso Machine
While we're on grinders, buying a GOOD grinder that will last, is just as important as the machine.
So something a step up from the Rocky like a Mazzer mini, Macap M4, etc are a worthy investment.
The site sponsors will all have a good deal they can do for you in a total package or single pieces
My own machine came from Jetbalck Espresso, and as a lightly used machine it was almost half the price of a new one.
I have the Dual Boiler Lelit PL60 and can have it up to temperature in ~5 minutes to make a very decent coffee. (a couple of tricks are needed like increasing the brewing temperature by 5 degrees and flushing some of that over-heated water through the group to heat up the group and piping and portafilter)
20 minutes or more is ideal to allow the entire machine to stabilise properly.
But my routine is to get out of bed, turn on the machine and then have my shower, this gives the machine ample time to stabilise and produce excellent shots.