What lending sources do I use??

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Hello,
I've been talking to a realtor from realtytrac that specializes in distressed properties. I have not been pre approved for a loan yet. She sent me to Wells Fargo where I do my banking. With the info I provided over the phone he said I will be able to be pre approved up to 750,000. My credit is good 710 range. The realtor now tells me Wells Fargo may be to high and I should go to Washington Mutual. Now I'm confused? What are your suggestions on what I should do? Go directly to the bank? Get a mortgage broker? Get a hard money loan? Please advise I would greatly appreciate your expert advice. Thank you :)