I strongly suggest you switch to RAW. Once you do, you'll look back and laugh every time you see your old JPEGs and how limited your post-processing is with them. The file size really isn't an issue with the low-cost hard drives available today. And unless you're travelling a ton or shooting many professional jobs, you shouldn't have thousands upon thousands of files to store. I've gone back through my libraries and critically selected good images while trashing the bad. I used to machine gun my photos and get 20 of the exact same moment only to store the 19 extras for no reason. Now I'm much more selective and have a much higher keeper rate with fewer overall clicks. Thinking before shooting and being selective has really helped my photography once controlling the camera became second nature.