There are two options on this subject you might want to take into consideration, taking in account that you intend to use 2 quivers, as any normal archer does (kinda makes sense...):
1 - Using a 1 slot bow, which the higher requirement one is Strong Bow:
With this option, you can be a decent hybrid archer, which means more survivability, with the option of either getting a 1 handed weapon of your choice, or even a 1 slot 2 handed weapon.
To help you further on the choice of the type of damage you should go to, if you invest low Power Strike, a piercing or blunt weapon is the way to go, in order to avoid glancing all the time. With 4 or more PS you can risk and get a cut damage weapon.
The range on 1 handed weapons within this choice can only be influenced by your own personal taste.
If you chose a 1 slot 2 handed weapon, there are two best options:
a) Spiked Mace: a fast weapon with 30 blunt damage, with the almighty Knockdown effect, which saves lives more often than you can imagine, as an archer. Optimal for low Power Strike investors.
b) Langes Messer: this is actually a 1 handed weapon which has a Secondary mode that turns it into a 2 Handed weapon with high cut damage, with better overall stats than a pure 2 handed like Katana. Optimal for 5+ Power Strike investors.
2 - Using either a Long Bow or a War Bow:
With these two bows you end up with 0 slots left in your equipment. Thinking about this the developers were "kind" enough to give the archer some melee options with 0 slot cost.
The best option in this sector (and to be honest, the only reasonable one) is to get the almighty-over-extremely-powered-op-omg-nerf-it 1 handed Hammer.
Costs 0 slots, has only 21 blunt damage, but has the upside of the Knockdown effect.
At the moment I run around with 6 PS on my main (archer) and a Hammer since I've been using lately a War Bow, and it's amusing the amount of times I've killed enemies (even tincans for my surprise) on melee encounter. Just trying to say that this little toy is more than enough if you know how to manual block or even risk some chambering.
Hope this little tips help you, and other archers around,
Cheers!