Your agent can provide you with a guide on what to offer....
By doing a CMA, you can find out the market value of the home
By doing a report on what listed and sold in the area you're interested in, you'll also see the pricing strategy(ies) employed by the seller(s).
Finally, in this seller's market, there are ways to make your offer shine. Cash offers don't always win, What type of listing is it? If it's a short sale, there are terms and conditions that are important to the seller and seller's short sale lender.
Think of how offers are rejected even when they are higher than list price.
Hope this helps.