I didn't see many options in this thread for a 2000 XJ. So I'm assuming that I need to go back with Stock OE injectors?
I can't speak as to other injectors or years, but the Bosch 0280155917 units (orange injectors associated with V8 Fords) have been in my 2000 for about 1200 miles now and there are zero issues with them. Installation is completely plug & play; you should be fine with these. Fuel economy has seen a steady 0.5mpg improvement, and midrange performance and throttle response are slightly better.
Best bet is to Google the part number for them and shop around. I was able to get a full set of six brand-new ones from eBay for what refurbs would have cost.
(BTW: please don't post the same question in different threads - makes it hard to keep things focussed.)