I don't like DSA. I have essentially a 60% set and the area of the top of the caps is too small for me. It makes me feel like I'm perpetually hunting for keycaps and I don't like that feeling.
I actually had the opposite impression. DSA was a bit jammy and the G80-3850 caps were nice. But they're pad printed and I started to wear the printing off.
I think the G84-4100 caps are the best of both worlds. Low profile and dye sub. Nice quality caps. If I had to choose between existing caps, I'd grab the G84-4100 board. If I could pick, I'd like the G80-3850 caps in doubleshot or dye-subbed flavors.
I never tried my DSA caps on a Costar board so I don't know if there are fitment issues.
Edit: ****, I just realized the OP is like two years old 
Yup.. necros can be irritating sometimes, often better for the poster to start a new thread with a title that matches more accurately what they're posting about.
Anyway, about the G84-4100 caps, there are quite a few versions, the most common lighter coloured caps are lasered, all the dark ones are pad printed. You can tell from the letter codes after the "4100". If it starts with L it's lasered, P is pad printed, S is dyesubbed.
Also, I find the 18mm keyspacing makes me mistype due to how it scrunches the keys closer together.
The 3850 keycaps are made by Devlin. I wonder if they have the molds and holders to be able to do doubleshots with those bases. May be worth an IC / GB if they can

The lowest MX stem profile SP makes is actually DCS. Row 2 and Row 3 are lower than DSA.