The mid-level MIJ plain top Tokai LS and the Deviser Bacchus. Deviser Momose for the high-end ones.
The cost issue was true until the last Gibson price hike. Now the high end Tokais, Momoses and Navigators are considerably cheaper than the equivalent Gibson Historic series. The LS340, LS420 and LS540 models use real Honduras mahogany. The LS420 and LS540 also use Brazilian rosewood for the fingerboards. Then there is also the SG196, which also uses Honduras for the body and neck. There are other more limited production lines, like the HLS series, in which the high end models also use Honduras.Probably the top of the line models which cost as much as a Gibson historic... althou I am not aware of a CURRENT Tokai model that uses real macrofilia mahogany.... and for all we know, Gibson uses real honduran mahogany on all the historic models (probably grown in Fiji, but still the same plant!) African "mahogany" is not real mahogany, it is similar, but that's a different plant.
I bought this 1983 Burny from Japanguitars.co.ukNice guitar blues. I have a late 80's Burny that is surely equal(I think) to the best of the current non custom shop Gibsons.
If I were you James(OP), I would go vintage MIJ. That is my specialty and I've played vintage, CS, boutique, etc. and they are the best bang for a serious quality instrument for let's say one fourth or more of the price. If you're interested this has about as much info as is probably known on the subject. I clicked it on the Burny page but the whole site is great.