Sammi,
Firstly, I wouldn't be in any hurrry to buy a property any time soon. On the other hand the northern half of Low Fell is one of my intended places when I finally buy a house. Having lived in Jesmond, and knowing Gateshead quite well, I honestly think that there is not too much difference between the Saltwell Park end of Low Fell and Jesmond, except of course that Jesmond is twice or even three times the price! Yes, I would prefer Jesmond but not at the price differencial: Low Fell is much better value for money. It is even walkable to Northumberland Street, though it takes the better part of an hour. Still the exercise is good for you!
The best course of action for now is to save as much as you can, so that you have a decent deposit at hand when the time comes to buy.
Good Luck,
Durham Lad