Yes, the center column of the 190XPROB and 055XPROB can be very easily switched to horizontal position. I've used it several times and it works really well, especially with a ball head (mind that the head is also tilted at 90° in this position, which can be somewhat unhandy when using a 3-way head. Manfrotto also has a separate Levelling Center Column Angle Bracket 553 available, to overcome this little 'problem').

I took a look at www.geheugenkaart.be, and it's indeed the cheapest that I have seen. The website doesn't look very trustworthy and professional though... very little information about the products, availability, and the payment and delivery conditions. I usually order at www.cameranu.nl, which I thought to be the cheapest (until now); they have a very good site, clear conditions about availability information, and I've never had any problems with information or deliveries. As you're from Antwerpen (I think), you might also take a look at www.fotorubens.be: they have almost everything in their catalogue (almost as cheap as cameranu.nl), but no information about availability (you have to contact them for availability)...

We do not see things as they are. ǝɹɐ ǝʍ sɐ sƃuıɥʇ ǝǝs ǝʍ