In reply to yorkshireman:
Hi,
I am based just the other side of the mountains form you, been out touring last few days and its been good.
With out wanting to repeat what other have said to much, boots are a big one and make a huge difference if they fit, both in comfort and ability.
For skis there is a few options, to be honest they all can work, I would go for something 95 underfoot up to 102cm that's a really nice range for different snow conditions and sounds like your fit enough to drag them up,
Have a look for local facebook groups and see what going on their, also if you have friends coming over from the UK check out British back country for sale facebook group they often have skis set ups, and they are a bit cheaper than France, and normally news sets, (if you have been in France a while you may notice that they don't drop much off for second hand). and if some one is coming out via car and can bring them you will probably get a better deal.
If it was out of season I would recommend glisshop they do some really good deal out of season but not so much this time of year, you could rent this year and buy during end of season sales. you could also swap different skis during the season to see what you, like if renting.
Also the decathlon is not a bad idea, I haven't skied there skis but I hear they are ok, i saw the other day they won some award (but that doesn't mean a lot, as most are just magazine give away awards), but there is no getting away from the price, you get a rebranded dynafit binding, ski's and skins for 650 euros, the binding normally are nearly 400 euros, ski them for a year and if you want to upgrade by new skis in the sale and keep the binding (ski's will always have sales, Bindings not so much) and by then you will have a bit more experience to know what you want.
Happy to help if you want any more advice, or when (if) we can travel further if you fancy meeting for slide maybe some where half wayish near the Lautaret let me know.
cheers Rob