These might not quite fit your definition of "not too expensive", but the William Henry stuff was the first thing that came to mind. Great looking designs, some nice handle materials.
Not exactly "gent" style, but the Reeve UmFaan is a nifty little gem.
See also Carolina Knives...they have a nice looking (never handled) Cocobolo interframe folder out of ATS-34. Should be decent.
http://www.carolinaknives.com/folders.html
Also, Paragon used to (and still may) sell a neat production version of a George Herron folder. I really dig this little knife, but don't own one yet. Semi-skinner blade profile (exceedingly useful style IMHO), cocobolo or black lipped pearl interframe inlays, $200. I should own one already.
About 1/2 way down the page at:
http://www.nwcutlery.com/paragon.html
If you aren't averse to a fixed blade, my favorite suit carry knife is the Bud Nealy Pesh Kabz in 3-1/2". Bud's kydex MCS carry system is brilliant. You can suspend the knife upside down (securely) from the inside left suit pocket. Concealed, quick draw if you care about such things. Might not be the best thing in some crowds at, say, nice restaurant to cut your steak, but anyway...
[This message has been edited by rdangerer (edited 06-20-2000).]