I purchased an Okidata C531dn.

http://www.newegg.com/Product/Product.aspx?Item=9SIA6ZP31F3956&cm_re=okidata-_-28-107-685-_-Product

It has features that help with color matching which is my biggest challenge. The color saturation is OK. I'd like to see blacker blacks. I may just need to spend some more time tuning it though.

I think it is more the nature of laser on thin membrane. Sometimes if I'm doing clear decals I will double them up on top of each other. But yes still playing with the settings.

sw1_(resized).PNGsw2_(resized).PNG

Your base should be white. That is the color of the backing paper for the decal. Anything else will change the color when mounted. The exception to this is when the color underneath matches the decal. Waterslide decals are very thin. Vinyl decals not so much.

Here is a trough that got filled in under the white decal. It should gotten painted white first:

9b_(resized).PNG

I mask the areas and airbrush white. You have to have a boarder to end on:
IMG_20140308_233545_(resized).jpg

Here are things to look for:
Separate toner cartridges for each color plus black
LED printheads - low temp so less chance of melting your decal
Color management interface - color matching is the number 1 challenge
SD Memory expansion
Can print on transparencies or velum - used to print drafts for alignment. Many printers can't do this.

IMG_20140309_141307_(resized).jpg

The line art on playfields don't really demand high resolution. If there is a difference it would show up in photos.

PC Mag has a good review section for printers. I'm not a fan of multifunction printers for desktop publishing. If the printer cost is $300 and has a scanner, then the cost of the scanner gets taken out of the printer. Xerox and OKI have a good rep for laser DTP. Epson has good inkjets. Laser class LED printers have an advantage when printing waterslide decals because they run cool compared Laser printers. It only takes one melted decal in the drum and you throw the printer away. Read the decal vendor's instructions about this. There are LED printers that don't preform well doing graphics so read the reviews. Also pay attention to paper handling. Decal paper is heavy. You don't want it to have to make a U-turn when it is fed to the top of the printer. A flat feed out the side is important. Printing transparencies is very important for me as I do a lot of PF repair work. Making sure everything registers correctly with the existing art can take many small adjustments. You don't want to burn through decal paper doing that.