Will you have a car? Are you willing to use it?
Rosemary's on West Sahara, about four miles from the Strip, is excellent.
Firefly on Paradise has tapas. Paradise is a couple of long blocks east of the Strip.
See
www.everythinglv.com - specifically the forums, and most specifically the restaurant forums, for suggestions; and the deals forum for, well, specials.
Get the American Casino Guide. It's got plenty of two-for-one coupons for restaurants, hotel rooms..
Lucio Ristorante, a little further west than Rosemary's, is also very good.
See
www.cheapovegas.com for, well, 'cheap' information and links.
The legendary shrimp cocktail in the diner at the Golden Gate downtown has gone up in price - but with a GG players' card, it's still only ninety-nine cents.
Restaurant.com has plenty of Las Vegas gift certificates, cheap - just be sure to read the rules, which vary by restaurant (e.g. some may require a $35 minimum purchase, some $50; some may be valid for only at least two entrees; many - but not all - are dine-in only; some may be good only for lunch; if a restaurant has more than one location, make sure you're getting the certificate for the right location...)