You will most likely get a higher price from a collector, but chances are a single collector will not want the multiples of each item that you have.
A dealer would buy the multiple items, but may lower the price they would pay because it may take them a while to move that inventory. Also, they may have enough of your items in their inventory already, which again would result in a lower offer.
If time isn't critical to you, then selling on eBay might be your best bet. That way you're selling to multiple collectors (most likely) and you can move your multiple items. There are fees involved (10% to eBay, 2.9% + $.30 to PayPal, plus your S&H costs for every transaction) that you need to look at. With the fees and time involved, it might make a dealers offer more competitive to you.
You could also consider getting an eBay store to reduce eBay fees down to 6.15%, but the cost of a basic store is $24.95 a month (on a monthly basis). So, you'd need to sell more than $650 of coins a month for a store to be cheaper than just paying the 10% fee.
Listing items for sale here on CCF is a possibility as well, but you must first have 250 quality posts. You can review the rules for selling here.
Whatever you decide, I hope it works out well for you.