Initially, I'm going to purchase a copy of HeartGold when it is released State-side. The reason for this is because when I started on Generation II, Gold was the first one I bought and the only one I bought of the original two Generation II games. So you could say I'm going for the nostalgia, this time around. I couldn't do that with the Generation I remakes, because they didn't release 'OceanBlue'. XD
But I opted to vote for both, because when released in the UK, I will probably purchase Soul Silver, as well. This is initially coming from my having all of the games, at current, for the most recent two Generations. XD HG/SS are no exception, because they are remakes of easily the best Pokemon games to date.