I'd suggest you start off here and bookmark this site:
http://www.tramontana.co.hu/citroen/index.html
That covers most things BX or hydraulic Citroen for that matter.
Another great resource is Brij Dogra's site from Malaysia. In the BX section, you'll find road tests and comparisons.
http://www.citroenz.com/
As far as models go, anything with an "i" at the end is fuel injected as Shane says. They are an ultra reliable set up, but I've owned 2 16Trs cars (ie) 1.6 litre carby models and I don't have a problem with them.
They have 2 main failings; the carby has a problem with getting shit in it and causing rough running and sometimes high fuel consumption as a consquence, but with a couple of decent filters fitted, I used a V6 Commode filter on one of mine prior the fuel pump and a smaller disposable between the pump and the carby, along wirth a float levell set as low as possible without affecting the running and taking the carby and hot box back to original after the local yokels have dismantled it

and you'll find 7.2L/100klms is quite achieveable. Performance on the 1.6 is nippy without being neck snapping and I have heard it said that the 19GT will stay very close to a 16V for performance.
The early engine seemed to also have corrosion issues possibly caused by dodgy electrics creating stray currents to cause electrolysis.
Low mileage TZis/Tris have this habit of guzzling oil possibly due to bore glaze, but seem to go forever and whilst they may suck a litre every 1000/1500 klms. they don't seem to blow clouds of smoke out the back. :crazy:
Suspension is a false bogey as it only has 5 spheres and only 4 of them diorectly affect the ride. At idle set in normal ride height, the front should push down reasonably firmly by about 4 - 6 inches. The rear slightly more but requiring much less force to push down. In both cases, the action should be smooth. Sticky struts aren't the major hassle they used to be since we learned how to lube them. They have problems overseas with struts seizing etc mainly due to driving on the snow that has been doused in salt.
Rust is a non event; BXs just don't rust as a rule apart from a bit that might get into the frame of any car with a sunroof and occasionally in a panel if the car has been in an accident.
At present, you'll find there's a few very cheap BXs floating around if you wanted to test the water with one. Some are so cheap that if you bought it and decided you didn't like it, you'd get your money back even in parts at a pinch. As a practical all round workhorse/shopping trolley/ sporty toy/family car they take some beating. They will legally tow 1100kgs and legally carry 1500kgs and all whilst staying perfectly level. We have 4 at our place and all are good cars that get used for a variety of purposes.
Read up on them and make an informed decision from there and as a bonus, I doubt you'll find any other car that has as much resources available to it as a BX has. The back up Worldwide is unbelieveable.
Alan S
