I'm going to purchase a .177 and I'm having trouble deciding between the Gamo Varmint or the Air Hawk Elite II, any suggestions would be greatly appreciated.
I would get something from Mike Melick with a tune. The rifles he sells are not as "fancy" as the ones you listed, but the XS-25 is the same platform as the air hawk. Getting it with his full tune will transform it into a different gun.
Years ago I bought an XS46U (underlever .177) from him with the full tune and it is an excellent entry level gun.
Search his name on the forum. I doubt you'll find a negative review.
Here's a link to Mike's store.
http://flyingdragonairrifles.org/index.php?route=product/product&path=59&product_id=67