For something simple, plain and not too strong, I would recommend Neffa Ifrikia. If you are lucky to get it fresh, expect medium moisture, medium grind and ust a whiff of ammonia. Dried out (often a case, and not a bad thing, when it comes to this particular snuff), it turns a tad finer and a wee bit more potent. It’s rustica snuff, but nicotine content isn’t very high, merely 1%. If you cannot find Neffa for a reasonable price, WoS Viking Blonde is probably the closest alternative (made from tabacum, tho).
If you prefer something stronger and like plain dark tobacco of medium easy-to-take grind with higher moisture and a sharp burn, go for Samuel Gawith Silky Dark (ex SG Viking Dark / Snuffstore Black Magic). It’s one of the strongest British snuffs. Be warned, it’s quite a dripper! Might be right up your alley, tho.
NTSU Black is even coarser, moister and stronger. Plain, dark.
Now if you crave for extra strong, give Janta Dragon Madras a whirl. Grind and texture-wise it’s similar to other Madras-type snuffs (plain, roasted, greased with ghee), but head and shoulder above most of them in nicotine dept. Honestly, I can’t think of anything stronger on the market.