Depending on your battlegroup.... If you can reliably win half of the time (or so) at 69 then sit there for a bit and grind marks, but don't worry about honor so much.
At 70 certain Marks of Honor can be tougher to get due to excessive loses. For example, in my battlegroup, WSG and EotS are usually losing games, so only 1 mark per losing match. Whereas AV is mostly wins, so 3 marks per win. EotS isn't exactly a Honor machine like AV can be, so grinding EotS at 70 is far more time-consuming than AV for me in my battlegroup. Your millage may vary. But at 69 EotS was far more even... almost perfectly 50/50.
Anyway, I had a very simple list of the basic gear pieces I was after when I hit 70 with the number of marks I needed for each.... I just did as many different matches as I needed marks and the honor came with was kinda bonus in my mind. Remember though, you can only keep 100 of each kind of mark in the bank (you can have more in the mail).
When I hit 70 then, all I needed was honor which was easiest (for me) in AV on it's holiday weekend. Combine that with doing the PvP daily ("extra" marks can be turned in for honor) and my lock was sitting pretty in some new shinies and ready to head into the 70 BGs. Well, he still needs a lot of work, but...
So my list of what to get (in order) was:
cheap trink weapons:
main,
off,
wand vindicators
wrist,
rings guardians
belt,
neck better trinket set items (to replace the
Blue Rep PvP set items)
I think I ended up going for at least 50 of each mark in the 69 bracket. And it made the rest of the grind much easier.
NOTE: I am NOT telling anyone to do it my way or that these are the ONLY gear pieces worth getting, etc.... Actually I'm planning on pushing haste. But this was my basic list I worked with during the 69 grind.
Hope that wall of text helps... Happy hunting.