I put Monroe quick struts on my 2003 Park Ave a few years and about 100,000 kms ago. They did well, no complaints from me. Quality can be hit and miss with quick struts, so check the warranty, check buyers' reviews, and buy from a reputable seller. They did raise the car somewhat, but that didn't bother me at all. Cleared parking curbs much better, which was nice.
OEM is nice, but the extra cost may not be worth it on an older car.