The 1.2 69hp has got a bit more "upstairs" than the rest, but it's hardly noticable, you'd need to be jumping in and out of them all to notice.
I do every now and then, my sisters a 1.2 - 60hp,
a new 1.2 - 69hp,
the mum in laws 10 plate 1.2 Eco - 69hp
and we're just said arriva derchi to a 1.1 - 54hp.
Having spent time in all of them, with the exception of the later 1.1 Eco, I still like the feeling on the bogo 1.1.
54hp is enough to drag it around quite comfortably, there's enough for the motorway cruise and it's entertaining keeping it "strumming" along.
But I fell for the 1108 (and the 1116 before that) along time ago, I like the "all you ever need that you use all the time" feeling, that begs to be driven the Italian way (valve bounce then change up a gear).
There's little in any of them mpg wise, the 10 plate 1.2 Eco returns a little better, but that's probably due to it's off peak use and little old lady owner!
Both 1.1 and 1.2 Eco models are cheaper to tax at £30.
Both non Eco 1.1 and 1.2 are non interferance engines, so no real need to worry about cam belts failing.
There are plenty out there, so test them all, don't write any of them off too soon, they're all very hardy.
There isn't much "kit" with them, but if you require aircon, then it's a later Eco model, if not I would look for a 2007 onwards car (red badges rather than blue), interior is far nicer with plastics a shade darker and non illuminous seats!
I shall be picking up a Twinair 4x4 Antartica on Saturday (yes, two new Pandas in 8 days and with illuminous seat and door trim), I'm not to sure what to expect from that, but the test drive did have me giggling at the noise and the torque low down did feel quite nice, didn't get chance to rag it, but it did seem like it was begging for it!