In terms of CIR and NGT VFR, I would just have to keep my CIR recency up to be able to fly at night. I would rather keep that up then pay for a VFR NGT rating.
Good call....that's what I did when I headed North. You have a rating that allows you to fly at night so why pay for another rating. The $ you spend on the NVFR would probably pay for 2 renewals...and who knows....you will may have the opportunity to progress to multi IFR by then (wouldn't it suck missing out on a ME IFR opportunity because you didn't have a current rating).
Personally, I would not invest in too many 210/206 hours-waste of money. Get a couple under your belt so you can go into a check ride with confidence.
Good luck.