Interesting choices. I'd beware the Faststash - it's a single skin shelter. Lots of space but you might find it needs the vents open to stop inner condensation bouncing off as mist in rainy weather, and that this might leave things a bit cold.
Also, the msr carbon reflex has a down-to-the-ground mesh inner - I used a mesh inner in the south of france in June, hot days but tthe breeze running over me in the night woke me. You'd need to think of where you'd use that one or have a heavier sleeping bag than I had. There's a similar msr with fabric inner, available on the same site, looks good.
The Helium is nice apart from the colour (black!) - I sat in the slightly
heavier, green version. Cheaper, nicer colour, still light - maybe they use the extra 300g well? It
is that wedge shape, of course so you'll be looking up at the fabric above your face when lying down. Still, not bad.
Vango Apex, nice. I read it was a bit short, somewhere, so double check the sleeping length if you are tall.
Seeing as you're considering the 340£ reflex, you may want to look also at the 1.2kg terra nova
Solar Competition 2. It's £260ish after you apply their 30% off tent trade-in deal.