just sold a 2000 enfield bullet 500, just like a normal bullet apart from poor finish, corrosion and rust better than chinese quality but not as good as british. it was ridden to Leicester and lost side cover lock on way!! not bad as thats all it lost on a 100 mile trip!
word of warning is cylinder heads , you can pick up porous ones . when I did one a few weeks ago for another customer they said it wasnt a regular fault only had 3 that week!! the other thing is they are prone to dropping exhaust vallve guide.
to impregnate the head and rebuild is around £150, to do the guide and re cut seat around ~£100 . oversize guides available.
As Jon said , buy original, will keep its value. our 2000 sold for £1400, but I have seen them at £2000 down to £900 it really is take your pick.