Hi, I have always had Lowrance and been very pleased.
I won a Colour Combi (not sure I have mentioned that before!!!! ) and it was great but in the end I got annoyed with the split screen so now have an additional plotter.
They share the same GPS receiver and are on a Lowrance Network - so all is good.
Remember to factor in the connectors and network bits if you plan to go for two. The Lowrance should however come with enough bits to join them together, I am not sure re. other brands.
p.s. a Lowrance is teh same as an Eagle, but I am not sure if there are any compatiability issues.
We do have a sponsor of the open who supplies kit - Martin B shoudl be abel to davise who they are.
Rob