That depends on one or two things...
1) Do you have access to friends who can and would craft level60 gear for you? If that is the case: Look what they can make for you and fill in empty slotsusing your feathers!
2) Intrested in PvP at all? You can get ilvl235 gear fairly cheap there - if you're intrested in that, I would go for leg and body first and then spend my marks on weapons etc.

For PotD - if you're intrested in doing that content, I would go for a Padjal-weapon straight away, not with all those cheaper options we're having! It resets your aether pool, so before you can go on, you need to go after silver chests again...

Considering how easy it is to gear up now, I would probably go for body and one weapon of your choice. That way you would have one healer whos already equipped with a decent weapon when you go and run some content to get tomes to gear up the rest.