So an NGC customer service rep recently told me that if you send in a currently NGC slabbed coin for VarietyPlus (no grading tier) it will automatically be reholdered in an SRH without adding ReHolder/SRH to the order. I find the implications of this rather interesting. Namely that if you are sending in an older scuffed up slab for the ReHolder service ($10) and it's a coin of a recognized variety, you can get the same SRH reholdering and variety attribution for only $5 more than the ReHolder service by itself. Furthermore, if you're sending in a raw coin and want VarietyPlus and SRH, in certain cases, it may be cheaper to resubmit the coin for VarietyPlus on a later order instead. Of course, you'd have to pay for shipping and the $8 order handling fee, but you save $5 per coin. If you can ask them to hold and ship the VarietyPlus order with other regular orders and/or drop off/pick up the order in person, it wouldn't take many coins to see some savings. More importantly, you completely eliminate the risk of having paid $20 for the SRH upgrade and VarietyPlus services on a coin that comes back details.
