If you walk about, you’ll want something for your head before you get a dedicated weapon scope. The new Nox can do both, so you might want to have a look at that.
If you basically move to a spot and hunker down for a while, you can get away with a dedicated scope. Super Hogster is cheap for what it does. I’ve never owned anything Pulsar and have heard mixed reviews from epic to disastrous. Nox by N-Vision is American made and looks to be pretty epic, but is at the high end of your range. A Halo 25mm (also NVision) or ReapIR 35mm are excellent options.
I’d start with the Nox, if you can swing it, and get a bump helmet and mount for it, if your heart it set on thermal.
Otherwise, snag a decent PVS-14, and IR laser like the TNVC TOR and a Vampire IR/white light plus a bump helmet and accessories.