Thanks, everyone, but padams35 hit the nail on the head, this is what I was looking for exactly !
as I bought the i7 8 core, I was hopeful that there would be a i9 10 core available a few years from now to buy off someone and then upgrade my iMac !
yesterday I bought the iMac with the 8 core i7, I thought long and hard over the 10 core I9, but I couldn't say the extra $500 was worth it...now, however in say 2-3 years from now, the 10 core i9 looks like a really good upgrade to look out for !!
was just wondering "what" i could upgrade into. seems like that 10 core is only option but that's awesome thanks for the help guys !!