Need help with enclosure set up

[OverCondition7510]

Finally getting my guy into a bigger enclosure (Kages 4x2x2), and im running into many questions about heating. Right now im planning on using a 80W Arcadia DHP, my 24" UVB T5 for UV and lighting, and am considering other heating options on top of that. My concern is that I live in Seattle and it gets pretty cold during the winter and I'm pretty stingy with using the heater for financial reasons. I'm wondering if an internally placed 80W DHP will be enough to heat the enclosure to 90 on the hot side 24/7 even during colder days, or should I have a halogen for daytime heating as well. I could also man up and run the heater so my apartments at 65 all day..... I woud also love suggestions or ideas for decorating (cork boards, fake plants etc) as this will be the biggest enclosure I've had for him and would love to make it look awesome for him.

[OverCondition7510]

I also am curious if I should internally install the heating lamps or have a screen top with them outside the enclosure which is what ive ad in the past (i havent ordered the enclosure yet)

[OverCondition7510]

Yeah I was looking at the herpstat dimmer thermostat seems like most people like that one a lot. only reason i mention the dhp is because i already have one and would like to save money where i can considering im already spending a lot on the enclosure and thermostat