Seriously, that's good news. My reason for saying that is that you will be lucky to get a good deal from 'Perrys Motor Pavillion' - not impossible (particularly if you catch them with a car that they haven't been able to sell for 30 days and are prepared to drop the price on, to move on). It is quite possible to get a deal from them, it is just that my suspicion is that most people don't.
To get an idea of 'market prices' look at the usual web sites (autotrader, exchange and mart, motors.co.uk) and also at Car Giant and
M Jarvis who usually have a number of Mondys. I'm not going to say any dealer will always give you a good deal, just the more that you look around, the more you'll get an idea of what constitutes a good deal, and what doesn't.
As a general rule, Edges are quite cheap, but almost everyone would prefer something with a bit more kit. Zetecs have a bit more kit and aren't that much more expensive. If you look at the kit list, and ask yourself 'What out of that lot do I really need' and then get a rough price, you'll have an indication of how much one spec is worth over the other, to you.
Most enthusiasts would prefer a Titanium which have quite a decent array of kit, but do fetch higher prices, and whether you feel that is justified is an open question. Ghias are supposed to be more luxury, where Titaniums are supposed to be more sporty/techie, but you never get the feeling that the Ghia sub-brand had quite the clear marketing focus that the Titanium variants did.
While you could add a load of kit on top of Edge/Zetec/Ghia/Titanium, the large majority of these would have been company cars, and most of the original owners will have just taken the standard trim levels, whatever is allowed for their pay grade.
As far as mileage is concerned, these cars will take big mileages, and that shouldn't necessarily scare you; on the other hand, things do go wrong over time, and, if a car has been neglected that will only get worse. But many cars will have done their introductory years cruising along the roads shown in blue on the road signs, and that won't have been too hard on them. (At least, I'd rather have a ex-motorway cruiser than an ex-demo car or an ex-taxi.)