I'm not familiar with that particular Bushnell but I'm pretty sure that Burris makes Pentax scopes. If it were me I wouldadd to your list theWeaver K4and theNikon Buckmasterfixed power scope. You could also pick up a used Leupold....with their warranty you would be fine. Here is a link to the Optic Zone and the Weaver K4...by the way, the Optic Zone has some great prices too.

http://theopticzone.com/detail.aspx?ID=2526


Here is my favorite option though:Buy a nice variable power scope. This would give you the excuse to buy a nice bolt action rifle so you can keep the open sights on the Marlin! Just a thought.