Best WC Payment Gateway with Card Reader Capability?

I’m opening a retailer and have plans to use WooCommerce as our online store plugin AND our in store point of sale(POS) system. I’ll be using an iPad with a card reader for our POS system and I want it to integrate straight into WooCommerce so we don’t have to maintain two accounting and inventory systems. Which plugin is the best and has the most cost effective rates for accomplishing these objectives? I’ve been looking at Inspire Payment Gateway, but want to look at other options before I make the plunge. Thanks so much.

http://wordpress.org/extend/plugins/woocommerce/