Does anyone have any opinions as to to the best GPS for the money?

In 2004 I purchased light bar and it is time to upgrade it. What I want is a graphic display of where I have been planting, spraying, and have skipped. I only have 450 acres so financially the big bells and whistles are out of the question. Nevertheless, if reasonable I would spring for auto steer as most of my fields are between 900 feet to 2100 feet long and it is easy to lose my place. On wider equipment I put wireless backup cams to reduce over laps or missed spots but this is getting to require to much attention. I map by pen on photocopies of my field maps so yield maps etc. I do manually by recording stopping points on the combine. Thanks for any info that you want to share.