I also would wonder if it is a good idea to be fixing your ipad1 especially for the amount quoted. This ipad did not receive the latest update and I would think that no future updates will be done for it.
With apps only getting bigger, I truly feel the ipad1 will struggle with its lack of ram.
As the Admiral has said a newer ipad may be a more viable option here, Apple do have refurbished iPads which they sell cheaper and with a full warranty.....but yes this is up to you.
Good luck with your decision.