Most affordable hotels on the Strip would be The Quad; north Strip gives you Circus Circus, Riviera, or the Stratosphere.
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The Quad is now the remodeled Linq & is no longer coming up as the cheapest. I would avoid the other 3 above--you will eat up any savings cabbing it all over. Even with a car, the other 3 are definitely 2 star properties.
Currently the best priced hotel on the strip is likely the Excalibur. Ballys, Harrahs, Monte Carlo & Flamino are all good choices as well--very centrally located. Choose one of those if they are comparable to Excalibur prices, or a tad more.
Buy an American Casino Guide for many coupons for a variety of needs.
Check out groupons & Living Social deals for Vegas. Travelzoo also has lots of great deals on hotels, dining & shows.
MyVegas is great, but you don't have much time to do much with it.
Check out the trip advisor Vegas forum for a TON of tips as well as Vegas Message boards--they are the 2 best Vegas boards on the internet.