As they said the dealer, I would expect it was not a detailer but a body shop tech that did it.
My personal recommendations for sealant (not inc the ones above, they are good too) is Autoglym (AG) Extra Gloss Protection (EGP). Doddle to apply and lasts quite a while. Make sure you leave it on overnight in the garage if you can. Also do a couple of layers.
For wax, anything in the Dodo range. Paul will tell you which suits your car, or Matt of i4detailing is a good lad, he'll point you in the right direction. We get a discount at i4d too I have Dodo Supernatural, and its f'in brilliant! Bit expensive mind.
Oh and I would recommend you use something like Dodo Lime Prime to get rid of any nasties from the paint as machine polishing wont get rid of everything. Will give you a glossy shine to work with the sealant and wax.