CM7 on a color nook
Mark: Go for a refurbed unit. you can pick em up on a ebay or overstock.com. B&N unloads the refurbs in both places. Or look for a used one on CraigsList. Don't spend more than $130 to $150. And $150 sounds high to me.
Just my opinion but I think you are just throwing away $35 for that card. If you have a medium speed microsd card laying around the house you can do it yourself. In my experience, and I have done about 15 to 20 cards for friends, your best bet is a 16 or 32 GB medium speed card from a reputable company. Hard to go wrong with Sandisk. I have had horrible experiences with Class 10 cards. They just never worked; lots and lots of crashes and forced closures. Huge improvement by using Class 4 cards. Cheaper and they work so much better.
If you Google instructions for turning you Nook into an android tablet and you will come up with a ton of (easy) instructions. Great instructions here on XDA just do a search.
If by any chance you are a Mac user send me a private message. I will send you a link to my Box for the whole kit and kaboodle for free. You can download the instructions and the required files. You can make the card and turn the Nook into a great little 7" android tablet in about 20 minutes. With a bathroom break.
I gave my Nook to my daughter when I got a 7" Galaxy. In some ways I like the Nook better than the Galaxy.
Performance is ok. With the hack I have you can kick the processor speed up a bit. It's fine for simple stuff. I even enjoyed watching movies on it. I used Handbrake to convert ripped videos into a format that worked fine on the Nook. It's a 7" screen. So it's never gonna resemble your 55" 240HZ LED but its fine to watch on a plane. I think its pretty amazing for the cost. You can access apps from the Market (damn I mean Google Play). I used Pulse on mine and it worked fine. Not much of a gamer so I can't share anything.
The version of CM7 I have allows you to dual boot from the card. If the card is not in the Nook it will operate just like a stock B&N Nook. Put the card in and you will get boot screen on startup. Its fine for reading too.