Code:
 Processor: Intel(R) Core(TM)2 CPU 6300 @ 1.86GHz
  Motherboard: Asus P5LD2
  Video Card: Club 3D Radeon X1950 (256mb)
  RAM: 2024 MB (4x 512 MB, 333MHz DDR2)
  Hard Driver: 250 GB
  Screen(s): LG L227WT 22" & ViewSonic P775 17"
Running on: Windows XP
Currently I'm dual-boxing with 2 accounts. The other is my brother's old account, it had WotLK upgrade already, so if I end up with buying some new hardware + purchase 3rd account, do I need to buy BC&WotLK for codes as well? I sent an RAF-invitation from my 1st account to my possibly up-coming 3rd account, and it had the 10-day Trial, so when I start to pay of WoW on my 3rd account with a credit card, will it get upgraded to WotLK or do I need to buy the 2 expansions?

Thanks in advance.