Many will disagree with me, but imo this is not the time to really worry about gear anymore. Don't waste honor points on any gear, except maaaaybe buying the s2 weapon. Instead try to bank 75k honor and 100 of each token on every character (that would add another 30k honor) so at 80 you can buy maybe a piece or two.

The starting instances in WOTLK are very easy, you could do it with whatever gear you got right now, don't need anything special and definitely don't need epics! After a few dozen instance runs (and/or quests) every item you got will be replaced, or stuff will drop that is 95% as good.

What really matters going into WOTLK?

- Stick with your team or rerolling DKs? Make this decision now, if you are rerolling you want to stock up quest items, profession leveling items, gold, etc for your DKs, and not worry too much about your current team.
- Gold. You can never have too much.
- Professions. Recipe drops, etc that can be used by someone on your team are nice. Some people like to replicate the same profession on everyone (5x alchemists or 5x enchanters), others like to mix up the professions so all 5 cover everything.
- Achievements. There are a number of achievements you can do now and in 3.0, it doesn't really mean much but you can plan this route out. Exalted with various factions is a achievement as well, I believe.
- Practice multiboxing. Whether its 5 man instance running, arena PVP, battlegrounds, outdoor PVP, or whatever floats your boat, its good to practice this now.

I just run the daily heroic (unless its slab or crypts or a few others I hate) so I keep practicing on 5 man PVE, and I'm doing some 10 games of arena per week (1-9 lol) just to practice, my gear is all greens/blues and just the s2 weapon. Banked 40k so far on each toon, playing 4-5 hours of PVP on the weekend, by the time WOTLK is out I should have 75k, 100 tokens of each, and maybe enough arena points to buy 1 season 4 item (lol)