Welcome back!
I'm maybe not the best to compile a list, I'm fairly new back too after a similar time away (wife, mortgage, kids!)and still changing over to modern equipment (2.4 radio and metal geared servos etc)
Deciding if you want to go 2wd or 4wd is a start (or both!).
Battery wise, lipos are kings now, no Nicad to be seen, and with 6000+ mah available, you don't need to worry about tuning gear ratios so the battery lasts the race.
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