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I just recently started collecting and due to my lack of experience in this game I have only used one website to order parts/ models from and two very small game stores with limited selections. I live in the United States as well which doesn't seem to help me much. What I am asking for is your "go to" online store or online seller for models/paints/accessories/bits.

Look through the ads at the top of the Dakka page.
Linky: http://www.dakkadakka.com/core/services_existingads.jsp
I doubt you'll go far wrong with any of them.

Apart from them, The War Store always gets mentions in these threads.
And, The Dakka Swap Shops for specific parts that stores might have trouble selling to you.

If I'm just looking for bits, eBay.

For bits, I'd suggest eBay. Some popular and reputable bits sellers are "bits-world", "hoard_*_bits", and "window-box". I've bought from all of them and had good experiences. Stock can vary from week to week, so keep your eyes open. Some sellers will offer the same item both in an auction format and buy it now, which is nice in a pinch.