There is some really good advice in here and I think if I could afford it I would take the combo route. Keep the ebay store, cut back on some of your items if you have to but keep the income coming in AND build your site now and start working on natural serp listings. It takes a looong time for organic search to pay off but in most cases when it kicks in you will be glad you worked your a@@ off to get there.

Its been a while back but I sold hi-po parts through an online site using nothing more than classified ads offline..ie: Hot Rod, Car Craft, etc until the organic took off. This worked well and wasnt very expensive. I moved to the NC coast and it ended up being to tough to find parts so I abandoned it but you are already on the right track just don't expect anything overnight and keep plugging

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Pokerdude goes all-in