If your house ambient is as low as 68 then you definitely need a RHP or CHE to maintain proper temps all year around. Using only heat tape/UTH generally only works well if you can maintain room temps above 75 at all times, but any lower you really need a second heat source or a heat source that raises ambient temps. A UTH + RHP may be best for you or just a RHP.
As for recommendations there is honestly no beating Pro Products for RHP's!
http://pro-products.com/pro-heat/
Just contact Bob and give him your cage specs and he will match you to the appropriate model that will best suit your needs! Great guy!
As for UTH's I really like Ultratherms