I would like to make my first wasc cake soon, but I'm not sure what type of icing would be best for this cake. I'd love some suggestions. Thanks!

Hi and Welcome on your 1st post, JenLyn902.

What icing you use depends on what type of icing you like.

Everything you need to know to make, decorate and assemble tiered/stacked/layer cakes:

http://cakecentral.com/cake-decorating-ftopict-605188-.html

Above superthread has popular CC recipes for crusting American buttercreams, several types of fondant and doctored cake mix (WASC recipes by Rebecca Sutterby and kakeladi - as well as flavor variations) and so much more!

Overview of frostings by type, as well as extensive info on the meringue buttercreams and a few others:

http://cakecentral.com/cake-decorating-ftopicp-6011626.html

Everything you ever wanted to know about ganache:
(Includes master and other recipes including white chocolate - and so much more.)

http://www.cakecentral.com/cake-decorating-ftopict-497433-.html

Chocolate 101:

http://tinyurl.com/ytby97

HTH