Question about appraisals

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I will soon be applying for a HELOC in order to get some start up funds for my flipping business. I'm trying to figure out the best, and most realistic number to give the bank in terms of my home value. I of course want as much as I can get, but want to also make a strong argument for giving my home a high value, as I know they'll be sending an appraiser.

I'm wondering if I should pay more attention to the price per sq. ft. that homes are selling at in my area and use that to figure out my number, or strictly look at homes my size?

Thanks in advance.