How to Wear A Tie Clip

I always angle mine downward, and it's intentional. I don't like the way a perfectly horizontal bar bisects the tie.

I like the calculated casual touch of having it at a slight angle. Horizontal looks to stiff.

(One of my favorite tie clips of all time was a silver paper clip from Paul Stuart)

I think it's accidental, at least I hope it is. Tie clips should always be horizontal, anyone who dose otherwise is either following a lame fashion trend or just simply dosen't realize it has gotten crocked.

I don't think it is accidental, following of a lame fashion trend or that it has become crooked ... it has more to do with the ideal of dressing oneself without appearing to have a 'forced' look as opposed to a more effortless style...

I like them horizontal. Only time I'd do it sideways is because my clip is too long for my narrow tie.

pointed downward brings an air of casualness to the outfit, which i like.

If it were up to people like you, we'd all look the same.

speaking of tie bars...wheres a good place to buy a simple thin one for cheap? by cheap i mean under $20? something similiar to this one from jcrew but cheaper:

I always wear mine at an angle, something about it being horizontal bothers me. Actually, I have a minor bone to pick on where to wear it. I wear because 1.) I like it as a decoration. 2.) I like a little bit of distance between tie and chest, and by clipping the tie, you can put a bit of an arc into it. 3.) I like to stop my tie from flapping around like a fish out of water, so I clip it just above the buttoning point. I've noticed a lot of people wear their tie clips really high up which is nice, but doesn't satisfy 3. Doesn't it bother anyone that their tie is constantly trying to get away from them?

Now an angled tie bar would bug me a lot.

HOWEVER, I might just leave it slightly angled, just like I might leave a sleeve button unbuttoned, just to draw attention to those who can catch it (aka girls).

Sprezzatura.
I say angle to your heart's content

Where is a good place to buy ones that are only 1" wide or so? ebay has them sometimes but I have only had luck with one vintage one, the rest I mistakenly bought too wide.

It does. That's why I'm considering getting a tie clip. I don't like the look of them though, so will probably keep it at a height that's just out of sight.

You mean sprezzatura? I think that then the best thing is to simply refrain from using a tie clip. Tie clips always look a bit "forced", IMO; they give me the impression that the wearer is afraid of getting his tie into the soup when eating.
I know that this is not always the case, but this idea always comes to my mind when I see a tie clip.