Scrooge says: Sell your full guthan's. With the peach you can train forever - cheaply.
Disclaimer - Please Read: The following guide is written by one of the cheapest, most pinch-penny, richest(?) (non-merchant) scrooges of Runescape.
The author is not responsible for any psychological trama that fellow players may experience as a result of following the guidelines within this guide. If you are the type of person that uses swordfish instead of tuna to train, or use barrows armor while training, it is adviseable that you stop reading immediately or risk being tainted by the author's abject me