Welcome to the site (our nuthouse)!
There are advantages and disadvantages to each pick. IMO, the 462 will handle a 28" light bar just fine.
They both have VG power to weight, and in stock form the 500 is not much stronger (ported it comes alive more).
The 462 is a little lighter and has the advantage of keeping the air filter cleaner much longer. There are also reports that the 500 is a fuel guzzler, often needs the springs replaced with longer bars, and may have some "cold start" issue when the temps drop.
If you are cutting mostly softwoods, I would go with the 462. If cutting hardwoods with over a 28" bar, then go with the 500. Either one will be a huge step up from your 290. I think if you are used to using a 290 you will be blown away with a 462.
I have 2 ported 462s and they are my go-to saws. Good luck with your decision, hope you can find one.