Some ballpoint models to consider:
Parker Stainless Jotter: Inexpensive very tough, lifetime warranty
and a GREAT overall pen, btw I use Fisher refills in mine
Cross Century Chrome: Again not expensive, great pen, lifetime warranty
Waterman Expert: My favorite (both pen and company), beautiful, heavy well-balanced, smooth writer, lifetime warranty. Also, if you get the Rollerball it will take pilot G2 refills
Lamy 2000: I don't have one YET but I've seen/used them, own other Lamys tri-pens and such, gerat company, GREAT PEN, lifetime warranty.
Fisher Bullet with clip: Inexpensive, fisher refills, lifetime warranty, great pen.
Pilot Dr. Grip: My second favorite inexpensive pen
Pilot Dr. Grip Gel: My favorite inexpensive pen, uses G2 gel refills.
Sanford Phd and Phd ultra (I think): also a great inexpensive pen, but i prefer the Pilots.
I own all of these Pens (and a few others
) except the Lamy which I plan to buy soon. All of these are great pens and I would highly recommend all of them. However I think the Waterman Expert is simply the BEST ballpoint or Rollerball or Fountain pen on the market. It will shame any less expensive pen and any pen that can compete with it will usually cost several times more. So if you want a fancy pen get the Waterman. If you want a tough EDC type pen go with the Parker, Cross, or Fisher, perhaps the Lamy (the Waterman's tough but you won't want to scratch it) Dollar for dollar the Dr. Grips are the best thing going though.