The D020 is very nice and super cheap, but it is pretty small. Some like this (I still do sometimes), but seems most like a bit more volume. Think D020-D is still available. It is a bit bigger.
I still love a sidecar mouthpiece with a dewar joint for a standard daily bubbler. Don't get hung up about the terminology, and no need to. Check
@Ratchett 's pictures of the FC-187 and GB-187 S next to each other on previous page. They both have each.
Sidecar just means mouthpiece comes out off to the side instead of straight from can. I like this for 2 major reasons. Usually allows you to see the perc a bit better, and control your draw. Slower draw (minimal bubbling) usually gives more flavor with these type percs. Sidecar also keeps vape from being right in your face with the vaporizors you mentioned. With offset sidecar mouthpiece, you'll be hitting it from off to the side a bit so your vape won't be a couple inches right in front of your nose.
Dewar is just the type of recessed joint that is usually right in top center of the can. This is good with the vapes you mention for stability (weight of vape is centered and not going to tip anything like other stems that come off from side of can).
I don't own the FC-187 V2 (and not really a fan of the V1 I do have), but V2 took care of the issues I have with V1 (high perc more than anything). My GB-187 is great and gets much use. Only thing I would change about it is to have a sidecar mouthpiece. And, will probably be ordering the newer S version to pick up that feature.
Be aware that it is now Chinese New Year. The whole country pretty much shuts down for a few weeks, so probably not the best time to order. You'll see people refer to it here as CNY. This should all be over around the end of the month. Am sure you can order now, but don't think anything will be moving forward there for a couple more weeks. So, first week of March may be better time to order. I'll probably order last week of Feb in hopes that things will be packed and ready to ship once everyone gets back to work over there. Have a feeling our favorite vendors will be chomping at the bit to get things moving as quickly as they can. They certainly seem to appreciate our business and our $!!