Your weight is great for so many boards. In my experience, and this isn't universal, taller folks have a wider stance or are more comfortable with a wider stance. I like to put them on longer boards. Just so that you know at 180 you're sized for boards in the 4'6" + range.
There is a phenomenon that folks experience when first learning. A longer board tends to offer more stability, but after a few months they outgrow it and can then step down in size. I have found that a good stable beginner board in your quiver is a good investment as invariably next year you'll use it to teach a new member of your crew.
As Scott Cochran pointed out in a separate thread - boards in the 5'4" - 5'6" range from the big three are cheap and easy to locate. Also, there are some good deals on used boards.
Virtually every wakesurf manufacturer offers a beginner board that would suit you. Things you might find useful to consider:
1) If it's important for the board to fit in your standard rack offerings from Phase 5, Calibrated and the big guys are your best bet.
2) Price can be a major consideration and the best thing to do is shop. For the most part the big guys (hl, lf and cwb) offer some good values in the beginner department.
3) Graphics are a matter of personal taste and there are manufacturers that will do custom art.
It seems like all of the entry level boards have some form of graphics on them.
The vast majority of manufacturers are listed here on the WW board pages. That would be a good place to start your research into price and graphics.
In the interest of full disclosure, I organize contests and I solicit product donations from everyone with a heartbeat.