Bar Suggestions (if a bit late):
DIY works OK if you have the time and ability.
Try Ikea for countertops - they have oak butcher-block style countertops starting at $89.
Easy to work with, and you can stain or go natural with a coat of polyurethane.
I was able to do a curved bartop for a couple hundred rather than a custom Corian, granite or Silestone ($$$). My application was an alcohol service bar, curved bar and bar top, in the back corner of my multi-purpose HT/Bar/Party Room. Can't wait to throw a Superbowl Party there next year ;-)
If you just want a straight 6' or 8' bar - you can get those off-the shelf from (booze) bar manufacturers. Beach Manufacturing is one, but there are many others: www.beachmfg.com
. The standard 42 or 43 height might be a problem for the HT applications you envision (not sure the height you were thinking).
On the other hand, you can choose not to raise the floor and allow the height of the bar/chairs to take care of raising the individuals for you (30 stools and 42 bar).
The downside of an off-the-shelf bar is they are designed with the finished side (looks good) and seating side (countertop overhang) as the same side, with the other side as shelves/cabinets for alcohol. You probably want the finished side and seating side to be opposite for this application, but it can probably work either way.
Maybe you make the guys in the back seats play bartender ;-)