I use a
RODE PSA1 pretty much everyday. They are very sturdy, hold their position, very quiet, no exposed springs, and supports the Rode Procaster, SM7B, and any of the condensers I have.
Plus it comes with an insert if you want to drill a hole in the desk so you don't have to use a clamp.
If you want to spend more than $100 then check out the
Yellowtec They are probably the best and cleanest looking arms around....but you're gonna pay for it (over $300)