Reddit mentions of Tiffen 77CP 77mm Circular Polarizer

This ND filter is cheap ($24) and works very well: http://www.amazon.com/gp/product/B00GNBHZR6?psc=1&redirect=true&ref_=oh_aui_search_detailpage

I have no complaints about it! I took this with it: http://i.imgur.com/K90hfvO.jpg

No issues with color cast or sharpness!

I have this Hoya CPL ($30) for my 58mm filters: http://www.amazon.com/gp/product/B000KL7J3A?psc=1&redirect=true&ref_=oh_aui_search_detailpage

No complaints, works amazing.

And this Tiffen CPL ($36) for my 77mm filter:
http://www.amazon.com/gp/product/B00004ZCI3?psc=1&redirect=true&ref_=oh_aui_search_detailpage

I love it.

Ah, I think you're right. The Nikon is here, and the Tiffen is here. Then the Nikon is more recommended?

I'm a bit in your same situation. I'm going to Iceland for 12 days and going to try and shoot a ton of landscapes with my Canon 60D and Tokina 11-16mm Ultra Wide angle (uses 77mm filters). Here's what I got on a budget from a little digging on Amazon.com:

Tiffen 77mm Circular Polarizer: $144; on sale for $20!

B+W 10 Stop Neutral Density filter: $252; on sale for $100

Tiffen 77mm Neutral Density 0.9 Filter: $99; on sale for $25

Step-up and Step-down rings let you use your pricey filters on your other lenses; saving you lots of $$$!
Fotodiox 7 Metal Step Up Ring Set, Anodized Black Metal 49-52mm, 52-55mm, 55-58mm, 58-62mm, 62-67mm, 67-72mm, 72-77mm: $13.49

Fotodiox 7 Metal Step-Down Ring Set, Anodized Black Metal. 77-72mm, 72-67mm, 67-62mm, 62-58mm, 58-55mm, 55-52mm, 52-49mm: $14.60

Pedco UltraPod II Lightweight Camera Tripod: $16.67 instead of a $100+ Gorillapod

You can go super cheap/artsy and use welding glass as a ND filter: $6 There's lots of easy tutorials on how to fix the color tint of the glass online.

Travel and photography are both amazing yet expensive hobbies. I hope my little list helps you out by saving you a little $ on the photo side; letting you have more $ on the travel side to do and see more... thus getting more amazing shots!