Sea-Dweller ... Date,without the cyclops~very clean dial.Crystal,standing out from the bezel~very appealing look.Heavier,higher casing~ sets appart from the rest.Very comfy to wear,but I do have large wrists.Overall,a very pleasing design.Bold,tough,yet elegant.
On your very first Rolex,I would suggest buying new and from AD.Just do the legwork for the best pricing.Cash is always King

Build a solid relationship with the AD.Do business with the owner,not the sales person.
A ss sport Rolex is an excellent choice for your first Rolex.Of these,the Sea-Dweller is the King