Hi Keye,
I would definately recommend taking a look in Central coffeeshop on the Prins Hendrikkade 89 (opposite Amsterdam Central Train Station), last time I was there they had some good stuff at very reasonable prices for the middle of the city.
Also if you like to be able to enjoy a beer with you joint you can still do this in certain bars, these bars will not sell cannabis as they only have an alcohol licence but they are still 'toker friendly'. Not all pubs or bars will allow this, here are a few that I know of
Kashmir Lounge Jan Pieter Heijenstraat 85/87, they have opened the another coffeeshop directly opposite and have converted the original coffeeshop into a pub/bar which is toker friendly and has an alcohol licence.
Lost in Amsterdam Nieuwendijk 19, I really like this place as they low tables, big soft cushions and hookah style pipes with shisha flavoured tobaccos. They also have an alcohol licence and is toker friendly aswell.
Nes Café Nes 33, This place used to be a coffeeshop be traded its cannabis licence for an alcohol one, it is a pool bar that has an alcohol licence and is still toker friendly.
If you want to try out the 'Verdamper vapourizer' then visit Anyday Coffeeshop Korte Kolksteeg 5/Spui Straat , this place has reasonable prices on weed and hash but they also have between 8 and 10 verdampers all set up ready for use.
If you want to try one then just ask the person behind the bar for the socket for the verdamper and he will give it to you and show you how to use it. IMHO the verdamper is the
only vapouriser that is in the same league as the volcano and is well worth a try. 'Verdamper' is the Dutch word for vapouriser by the way.
Have a great time over there.
H.T.