I've had my Park Ave for 6 years now... a 2001 Park Avenue (not Ultra) with the Prestige Pkg mentioned above. Also has the Head-Up Display and the reverse sensors. Bought it with 64,000 miles...just turned 123,000 miles. It's been a good car for me. I still love it. If I were to get another, I would stay with the 2001-2005 models, because I want the reverse sensors (helps in parking in downtown). I love the Head-Up Display. These cars (Park Avenues) are reasonably priced usually and ordinarily well-cared-for.
The pros: Solid, sturdy car. Good handling, even with FE1 suspension. The 3800 engine seems to be pretty reliable and parts are readily available. I love that EVERYTHING is automatic (memory seats, windshield wipers, A/C, lights, mirrors, rear-leveling...etc). It is truly a "point and drive" car. Very easy to live with.
The cons: The seats can be very problematic (motors/gears stop working, heated seats stop working...make sure you check all functionality of the seats). The leather is poor quality, but finding cloth (97-99 models only) is next to impossible. Some people have had problems with the auto-levelers in the rear. The upper intake/EGR issues need to be addressed.
As far as the 2000+ LeSabres, I believe they are very similar to the Park Avenue. I know that the reverse-sensors were not available on them. I don't remember if the auto-windshield-wipers were. Head-Up Display was available on higher-level (Limited) LeSabres. If the reverse-sensors were not that important to you, I would bet that you would be just as happy with a LeSabre Limited as you would a Park Avenue.
Hope this helps.
