If you plan to jump in France take notice of their regulations regarding canopy size/jump numbers. They are pretty strict I hear. I haven't jumped there but there is a minimum jump number for canopy sizes and they are rigidly enforced I believe so it is worth investigating if you plan on taking your own rig. Google will help you I'm sure. I jump Skydive Madrid and Algarve. Both have great people. Algarve has great beaches too
I have a safire 2 150 and a PDR143 in a 310. I have also had pilot 170 zpx in it with the same size reserve. It is tight but I have not had any issues.....as yet. I am a noob though and this is just my experience so far. I don't have enough knowledge to comment on whether or not this is good but nobody has mentioned an issue after rigger inspections and reserve repacks.