[GruntMoanCough]

Don't know if it'll help but, I'll throw my toonies worth in.
I use the 497-00 exclusively and am quite happy with the results and cost. Once, when the weather was hot, I used 483-79 activator and mentioned to my rep how much better it flowed out over 483-78 activator. That's when he suggested the 465-00 clear and how well it flowed and the better image results. Been meaning to try it but, haven't as of yet (sticking with what I'm familiar with, I guess).
Anyhow, IMO, the second guy that you talked to doesn't know what he's talking about since as far as I know, the 465-00 came out after the 496-00, 497-00, and 498-00. BTW, I haven't used the 498-00, I presume that it is meant for panel painting and not so much for overall use, since it is quicker drying
The only thing that i would suggest is to use the 465-00 on the insides and see if you like it. I don't think the difference would show if you were to use 498-00 or 497-00 on the outside later.