I use the Extra Firming Range which I think it the category that you would fall into age wise.
It seems I have the same skin type as you, combination but also sensitive. I also suffer with eczema so I cannot just use any products as usually I flare up. I have never had a flare up with Clarins, so I just stick with it. I have noticed a difference.
I have quite a lot of their products, lots of them as samples (as I know the Clarins lady really well now, she give me full size products as samples).
I use the green toner for combination/oily skin in summer, with the day cream and neck cream. Winter I use the yellow toner as my skin is a little drier then. I use the foaming facewash, again its one of the few that I like that foams well but also doesn't flare me up.
I have the double serum, but since getting a sample of Estee Lauders Night Repair, I don't honestly think I prefer that. Beauty flash balm is ok, again only ever had samples of this, but I don't like it enough to buy a full size one.
I also use the exfoliating toner from time to time, I didn't think this was something that you should use daily, so I use it weekly or when I remember 
I really love the shower gels and body lotions. The scent stays with you all day, you wouldn't even need to wear the perfume as well. And I don't know if its just me, but it gives me a clear head in the morning..
You can buy gift sets, that work out more economical. So there would be a day moisturizer and night cream and then a bigger sample of something else, with a bag (although this is just a bonus really) but then as well as that you would get a handful of other samples too. And with Christmas coming up now, there are sure to be some nice sets available.
After you have bought from the salon, it is a good idea to shop around, as they are expensive, but it there is quite a big price difference from place to place. I now buy mine from a chemist who you would never have though stocked the range, and they are so much cheaper than the big stores with the fancy counters.
If you start with a cleanser (face wash type or cream cleanser), toner, day cream and night cream, that is really all you need. The other products are nice, but not really needed for essential day to day skin care.