Right now, I'm using a magnetic travel set, and was thinking, of upgrading to a wood and (glass,Yunzi,etc..) set. But I'm not a good judge of Go equipment quality. And was wondering, if anyone could give their opinion, on sets within 50-80$ range?

http://www.go-gamestore.com/goequip/sets.htm

I thought these sets looked nice.

Either the 65.00 from the link you posted, or a similar board and yunzi stones from ZenGoban (http://www.zengoban.com/) should work just fine for your purposes. Given the high shipping from your link, I think that zengoban turns out a bit cheaper. From what I've seen, their prices are really hard to beat, for bamboo and yunzi.

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Someday I want to be strong enough to earn KGS[-].

I think yunzi are the best stones, it's a nice bonus that they're so cheap.

Bamboo is pretty cool too, it looks nice and it's indestructible. Especially if you get single-convex yunzi - their bottom edge will ruin any soft wood if you slam them down, but bamboo survives it fine.

(For this reason, do not get single convex stones and a spruce board!)

Bamboo+single convex yunzi is authentic, nice looking, practical and cheap - can't recommend it too highly.

You have to go with what you like a bit. I'm not a fan of bamboo and yunzi.

Saying that, my recommendation is a folding board from Yutopian ($58 or $66 depending on wood) with 8mm glass stones and plastic bowls ($24). Slightly over the budget but they do have some other cheaper options.

If you have a Korean grocery near you, they often have good quality cheap sets. I got one for $25 I was happy with.

The Bamboo Marble Set at GoGame Store is very nice. I like playing with stones that are actually stone and the bamboo board is very sturdy. Also, the board at GoGame store has a 13x13 grid on the back while the one at Zen Goban has a Xiangqi board.

Could someone tell me, if this is true?

Kiseido says,
http://www.kiseido.com/go_equipment.htm

Or does this only apply to single convex Yunzi, like Palapiku said?

No, spruce really is very soft. You can almost dent it by poking it with a finger. Single-convex stones are just especially bad, they carve ugly triangular dents in it, as I discovered within minutes of owning mine.

Mind you if you slam stones *really* hard even bamboo will dent.

I think finaly decided, that I'm getting this one. It looks like a nice basic set, and it has free shipping.

http://www.chessngames.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=CNG&Product_Code=22822-07K&Category_Code=08010GOSETS

Thanks everyone, for all the advice.