[mos_skeeto]

I would first decide on ink vs laser as that would cut your choices down by half.

Every hates on ink these days but I see a market for them still. You can get scanner ink combos starting at 50 bucks on sale and ink image prints look really good. The cons, and everyone hates them for these, are expensive refill costs and ink drying up.

Laser is nice and best bang for the buck if you're printing more than a few pages a month. If your wedding invites have a lot of solid colors and shapes it will look pretty good. If you have a lot of photos and gradients, household laser printers don't look that great. I would invest in getting it printed in a shop or online.

Get the cheapest one that does the job because they're all poorly built. Low end printers are quite good in terms of scanning and printing quality for day-to-day stuff but I would farm out professional printing stuff like wedding invites.

I've done one sided invites before though 4x6 photo lab prints. I'm sure the photo labs hate me for doing it but it's hella cheap.

Also keep in mind that you have to add refill costs to your purchase budget because most printers will run out of ink/toner in no time.