QUOTE(Petite Joueuse @ May 15 2006, 11:06 PM)

Restring is going to cost about £2000-£3000. I reckon I could probably buy a new decent piano for that price.
So...please....help me to make my mind up!
I DO love my exisiting piano (50 year old thing!) - I LOVE the feel of the keys and I've never felt keys like them on any other piano. But am I throwing money at an old piano with good reason??
Aaaaaaaaaaaaaaargh! Don't know what to do!

Seek professional help. A piano tuner would surely be able to assist. Ask whether the other parts of the piano are in good order and worth keeping. Perhaps you could ask the person who recommended that you restring the piano? You cannot really decide whether you are throwing money at an old piano for no reason without this information.
For example, it would in my opinion be unwise to spend this money on a piano whose hammers need replacing or need work. The state of the hammers (which after all hit the strings to produce the sound) is a very important factor in the tone that is produced.
As to whether to buy a "new decent piano", I personally would hesitate before ever buying a _new_ piano (unless I were to receive a lifestyle-changing amount of cash) as one can get very good value used pianos by looking around.