I am helping a friend to look for one too! But my other friend had experience that the wedding planner or the decor designer got stuck with their routine >___<" and just can't think out of the box. It took them a good few months to finalize on a ok design.
What I have gathered is that its the best if the couple would sit down and figure out some design first before even approaching any planner. Its even better if you order some save the date card or other must have items (cheap yet substantial) to lead the planner or designer to the right track. And I do mean order/buy, because without showing them something on hand, the professional could easily talk you into some other design.... or worst case... try to upsale something to you...
Try out this place online http://tinyurl.com/customweddingsupply for ideas and custom cards and what not. My friend is holding a bunch of cards from this place to meet every planner or designer and see if they can actually work "for" us... or just going to throw us a design 
I will give the few recommendations up top a try, thank you |