That's what I thought about the 2445/Zumo - but theft is such a big issue out there - the (new) 2445 only cost me £40 so if it only lasts one season it's worth it! I've just found a second hand 255 to use as backup in case the 2445 doesn't survive!
Shame about the c510s though - they seem better built than the more modern units. It was a long shot.
Ian