I enjoyed the first Hitman and Blood Money (that was 4, right?) as well, and I loved Silent Assassin. So it's fairly likely that I'll get Absolution, too, but I'll wait a few months or more after launch for it to drop in price.
I particularly like taking a stealthy approach in games of this type, but I did enjoy that you could have a more aggressive style of gameplay, too, depending on the mission and what you felt like doing at the time.