some 1st gens had plastic tensioners, fixed mid 02 (need to check build dates)... But your asking our opinion on these cars, but not taking any of our advice... (so if you want a first gen, go buy one). Nothing we can warn you about will stop you. And nothing we'll be able to list, will be something you'll be able to know when buying. (COPs, cooling, etc.)
your best bet hands down in an 06. after that, your rolling the dice on any other model.
06 best... 00/01 v6 worst (but for reasons you can't filter out when buying, without complete service histories)...
can they BE reliable (that depends on your defention of reliable). MY 02 has been amazing!! but thats my opinion, someone else may think otherwise.
Your arguing opinions, not facts... With our expereince here (as a site), we say for a FACT that an 06 is a better buy and 1st gen.
That said, its your car/time/money.. buy what YOU think is best (not the internet!!!!)
GL