i will give you my opinion, but be aware it is just an opinion.
If you don't do a degree now, you will have to at some point in your career. As nursing is going to become an all-graduate profession, as your career progresses you will find yourself unable to compete for more senior jobs against peple who have a degree. It is much easier to get a degree now that when you are working full time, believe me!
I believe that in some places you can start off doing the diploma (thus getting the bursary) and switch to the degree at the end of it, and do another year (i think).
as for your second question, it depends what you class as "nursing care" in a modern ward for example, (i have just come out of hospital) the hca's did all the obs, blood tests, ecg's, dressings (following a care plan written by the nurse), answered all of the bells, helped people walk to the loo, did most of the personal care. The qualified nurses did all the tablets, doctors round and discharge planning, and also spent more time with the iller patients. CVP lines for example were only seen to by the qualified nurses. this was an orthopaedic ward. I have been very lucky in my career to have worked on wards with a high ratio of qualified staff. This meant that you had to do the above yourself. You can learn so much about someone just by helping them with a wash