the megs deep crystal stuff is pretty good, gives a nice finish, but i've not used other paint cleaners (stage 1) the polish is ok, not tried any of the premium brands to give a comparison.
black hole worked really well on my indigo blue car, made the paint look much deeper
wax: i've got chemical guys natty paste - seems ok, cant complain although there is probably better products out there but for 14 quid or so its not gonna bust the bank
as for window cleaner, i find windowlene cream works better than most of the car window cleaners i've tried.
i'm not a detailler or valeter, so dont have a lot of experience in these matters.
for sealant i used jetseal wet mirror. wasn't that impressed with this imo, didn't seem to make much difference to the look of the paint.
hth
