What are the best "value for your money" restaurants in Philadelphia?

My wife and I, as well as our friends, love to eat at the Sang Kee Noodle House Asian Restaurant.  There are several locations in Philly but we most often visit the one in Wynnewood on the Main Line.

The Asian food is consistently delicious, reasonably priced, and served with quickly, efficiently, and pleasantly by an excellent staff.  You will be treated with kindness when you enter, fed well while you're there, and leave completely satisfied … eager to return next time.

BTW, try to avoid times when it will be very busy like Friday and Saturday evenings.

What restaurants in Philadelphia offer a really great or unusual dining experience?

There are so many great unusual options in the city:

(1) Jones – Stephen Starr's homage to the Brady Bunch era serves up homestyle comfort food atop a shag-carpeted floor.  Bonus points for being kid friendly.

(2) Victor Cafe – Good Italian food, great operatic performaces from the waitstaff, and the filming location for Rocky Balboa's resturant in the last installment of the Rocky saga.

(3) Dante and Luigis – South Philly.  Great food.  Feels like dining in the middle of a scene from Goodfellas.

(4) Barcade – This place is 3/4 bar and 1/4 restaurant, but packs a million beers and dozens of old video games, playable for just a quarter each.  Located in Fishtown.

(5) Marrakesh – Morrocan food located where all the hippies meet – South Street – Great middle eastern ambiance.

(6) Hop Sing Laundromat – A bar, not a restaurant, but very unique!  Located in Chinatown, basically a 20's era speakeasy.  Be ready to order classic cocktails and be sure to dress up.

(7) Federal Donuts – What?  A donut place?  No way – its more than that.  Two locations in South Philly and Center City, this place offers three things: Great coffee, amazing fried chicken, and crazy-good donuts.  What's not to like?

(8) Vedge – World famous vegan restaurant.  So good, you won't know you are eating vegan.  Booked up months ahead, so call early.  Located in Center City.

(9) Brauhaus Schmitz – German food.  Giant steins of beer.  Hipsters.  South Street.  Amazing!

(10) Reading Terminal Market – Philly's daily food market, located in Center City.  Try the Peking Duck, Italian Hoagies or Amish country fare, with Philadelphia Butter Cake for desert!

What are some affordable and delicious BYOB restaurants in Philadelphia?

Defo agree with many of the others' answers; Absolutely recommend Matyson for a BYOB, as well as Chloe (at Chloe, be prepared to wait as they don't take reservations).  Matyson has this fabulous weekday tasting menu that includes four (maybe five?) courses for $45, and it's always done me right. There's typically a theme (asian, duck, lobster, farm to table…usually seasonal).
 
I also like La Locanda del Ghiottone (House of Gluttony, if you're wondering), which is really reasonable price-wise. Definitely order the mushroom crepes.
 
I'm also realizing, in answering this, that there are quite a few I've got to add to my list as well. Great responses so far. Cheers!