I don't want to be like everyone else and wear a ridiculously poofy powder blue dress like every other girl that goes to prom. A little poof is fine that's not the issue. I want a prom dress that's different but not Lady Gaga different.

I know what you mean, some girls prom dresses are so over the top fancy and cookie cutter!  I agree with the finding something different mentality completely!
I found alot of beautiful, and unique prom dresses at Prom Girl! They are really good quality dresses, but very affordable!
One choice is a short metallic halter dress which sells for $25.00! 
specifics are:
Looking for a great ivory cocktail dress or a short ivory dress with a halter top for that special night? Check out this lovely short ivory halter dress by Lenovia. PromGirl has an extensive collection of short halter top dresses for all of your special occasions. Made of 100% Polyester

Another amazing dress is a sapphire blue strapless dress which sells for $99.00.  this would look so nice if you happen to have simple sapphire jewelry!
specifics are:

• Tight-fitting, shirred party dress
• Front bodice has front sash
• Back zipper closure
• 100% Poly Satin
• Made in USA

A really pretty and unique dress is the blondie nights" dress in either black and ruby, or black and grape which sells for $110!
specifics are:
Many designer dresses for prom are short and sassy for 2010. This Blondie Nites designer dress features spaghetti straps on the shirred bodice and a short full skirt with a shimmering design on the mesh overlay. A wide black sash that ties in the back will flatter your figure and give you the perfect look for your prom or homecoming

I will also add a few more selections to look over!