Here are some ideas about HP color laser printers with auto-duplexing capabilities - from the HP website:
http://search.hp.com/query.html?charset=iso-8859-1&lk=1&la=en&nh=10&rf=0&qs=&hpvc=sitewide&uf=1&st=1&qt=laser+and+color+and+two-sided&submitsearch.x=0&submitsearch.y=0
For reviews on these printers, you may want to check out ConsumerSearch:
http://www.consumersearch.com
- a consumer website which collects and consolidates reviews for all types of products and makes recommendations based on their analysis of various reviews.
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If you're willing to consider inkjet....
HP and Amazon currently have deals (links below) (c. HP $180 after instant rebate - Amazon - about $130 (you have to add item to your cart to see the price) on the HP Photosmart Premium All-in-One (HP Model Number CD055A#ABA)
This printer prints, copies, scans, and direct digital photo prints. It offers automatic two-sided printing, prints up to 33 pages per minute, has black print resolution up to 600 x 600 dpi / Color print resolution 9600 x 2400 optimized dpi, among other features. It has a one-year limited warranty (I believe extended coverage is available, at a cost).
http://www.shopping.hp.com/webapp/shopping/product_detail.do?landing=printer&storeName=storefronts&category=Photosmart&catLevel=2&product_code=CD055A%23ABA
http://www.amazon.com/Photosmart-Premium-Printer-CD055A-ABA/dp/B002GWVZHW/ref=sr_1_1?ie=UTF8&s=electronics&qid=1271344605&sr=8-1
(REMEMBER THAT YOU HAVE TO ADD THE ITEM/PRINTER TO YOUR CART TO SEE THE SPECIAL PRICE)
Here are some reviews of the printer:
http://asia.cnet.com/reviews/printers/0,39051175,45127100p,00.htm
http://www.consumerreports.org/cro/electronics-computers/computers-internet/printers/all-in-one-printer-ratings/models/overview/hp-photosmart-premium-cd055aaba-99028790.htm
(THIS REVIEW REQUIRES A $5.95 SUBSCRIPTION (AUTO-RENEWING BUT YOU CAN CANCEL AT ANY TIME)
Regarding ink costs, the HP brand higher-capacity inks for this printer (they are listed under one of the tabs (= "Cartridges") on the first link above - the HP product info page) - may seem expensive (about $30/ per black cartridge and $18/for each color cartridge) but they do offer cheaper lower-yield ones (about $10-$12/cartridge) (the higher-capacity ones are a better deal in the long run).
Keep in mind that you could also save money by purchasing high-yield remanufactured cartridges for this printer:
http://www.castleink.com/search.php?brand=hewlett-packard&tpl=22&catid=39&pg=16&type=InkjetsArray&model=PHOTOSMART+PREMIUM+C309a&Input2.x=23&Input2.y=11
I hope this helps.
Kerry