"Around" $5 is quite limiting. The PSI Vertex is hard to beat IMHO - but it's more in the $7 range. The chrome version of the PSI Slimlime Pro is there, but I'm not a fan of the black clip (I save clips from their seam ripper kits and trade out).
I also like the PSI trimline kits. At $25 (ish) for a dozen, it's hard to go wrong.
The executive is a better writing experience with a gel cartridge and I've been kicking around the idea of trying to modify them to accept a pilot g2 rollerball refill.