hi harry ,
yes the 51s1 will put the r2000 to shame and indeed is in a league of its own.i've collected many old boatanchor over the yrs but have yet to own a collins
.i keep telling myself one day i'll get one.good luck with the 51s1.as for file size limit the resolution to 900x900 and you will be fine.just use a picture resizer program if theyre bigger than this.