Capital,
You might want to finesse the whole issue and take them out for dinner. Lots of restaurants have CNY Banquet menus that are sure to please and it will likely save you a lot of work and anxiety.
However, if you do want to cook:
1) Check to see if your husband's family has a tradition of going vegetarian for the first day or the first 3 days of CNY. Some families do and others do not. This will undoubtably influence the menu.
Here's one person's menu on a blog
http://www.eatingchina.com/blog/NY-dinner.htm
Lo Ba Gou - turnip cake - in our family we make it, but others do not
* trad because you can eat it w/out using a knife to cut
*trad because it can be made ahead of time and just steamed or fried - CNY should be a relaxing day
Jiaozi
* Some families have a family jiaozi wrapping session late night on CNY eve, but I think that's more of a northern thing - not so much Cantonese.
A dish that has faat choi (the mossy stuff that looks like hair) - But I've heard that it's a somewhat endangered species.... But my m-i-l makes it.
Big whole steamed fish (yu = prosperity)
Neen Gou - (In Mandarin, Nian Gao) New Year's cake - often made w/ rice floure and dried fruits
http://www.chiff.com/recipe/pages/10125.htm
Mixed veggies (Often called Buddha's delight)
http://chinesefood.about.com/od/chinesenewyear/r/buddhasdelight.htm
I have found this book very useful. It's written by a Chinese-American woman and is full of recipes and information.
http://www.amazon.com/Wisdom-Chinese-Kitchen-Classic-Celebration/dp/0684847396
Make sure you do not end up w/ 7 dishes (unlucky - it's the number of dishes served at a funeral).
My husband is HK Chinese and since we're a big family, we tend to have the "reuinion dinner" at a restaurant and have semi-potluck for the dinner on the first day - everyone brings dishes.