Cash is king these days, so I would not derail your original plan. I would however, fire it up. Who knows you may like the product and want to keep it.
For initial comp rigs, the WSM's are hard to beat. Lightweight, relatively inexpensive and can be broken down for transport. The P&S, well ask your back...
Words of Caution - do not sell it to a neighbor on your street. His comments of it being the best cooker / investment EVER, will certainly increase your beer consumption.