I used Vega Asia for backhand in the past, it's not a miracle rubber, but fast enough and easy to handle and very cheap nowdays. The top rubber feels rather soft and the sponge is also not too firm. I like its relative insensitiveness and speed on my BH. I don't use it anymore but for ~30USD it's great. It's a good Tenergy 64 alternative on the cheap.
I never used Vega Europe extensively but many people who I know love it. It can be also used for backhand, not just forehand. When I tried it, it was easy to do spinny open ups with it. It didn't feel as fast as Vega Asia, that's why I wouldn't use it on BH personally, but it could be good for others. I think this is created as a "feel good" rubber for the people who used to enjoy the speedglue era. It has that kind of sensation.
DHS Gold arc 5 I only said cause it's for sure below 30USD and I think it's similar to Vega and Hexer series, not high end, but for sure miles better than AK47.
Gold Arc 8 I tried, it's really well balanced rubbers, similar to Rasanter 47, Bluestorm, Nexxus, Rhyzer etc series of rubbers just cheaper than all of them. You can read a lot about these rubbers. I think Gold Arc 8 is probably the most balanced of all these German made ones, but they are all basically the same thing with a differently colored sponge.
Mantra and Rozena are Japanese made and are not factory boosted so their performance won't change much during their lifespan. Of course the wear will make the grip worse over time, but German rubbers are factory boosted and after 1-2 months they change play characteristics. (get slower, more dead, their size shrinks if you take it off your racket) Also Japanese rubbers are a bit lighter which I care about.
Rozena is like a Tenergy 80 "lite" in my opinion. Bit slower, bit less spinny, bit softer, but only really marginally. And more easy to use.
Mantra is a very stable rubber, direct, not spin sensitive, doesn't do any magic but does everything very well. Very well balanced.
I'd probably pick Rozena from Prott if I had to chose from these. If you can get MX-P for 30ish USD that's probably even better, but I don't think that it can be purchased for that cheap. MX-P is also German, factory boosted, but it is different than other German rubbers. Anyways German rubbers have many issues so I don't like them, but for 30UDS you can get some of them and those tend to be significantly better than Chinese made euro/jap style rubbers.
If you're not shy of sticky hybrid rubbers Hurricane 3-50 35deg version is very soft and feels good, bit slow maybe but very enjoyable to use, has a nice speedglue feeling and sound, just don't expect the speed with it. It won't feel very foreign to use, it's not like a H3 Neo at all.