I can see exactly what Harlequin is getting at with that question
He/She (she?) is correct in asking.
As in a 10gal out of your list...
2 angelfish - Too big
5 guppies - Fine
1 plec - Probably too big (there are only about 2 plecs suitable to 10gal)
1 dwarf gourami - Bit of a squeeze but so long as it isn't kept with any other gouramis shouldn't be too much agression to tank mates.
1 platy - Fine
3 neon tetras - I certainly wouldn't put them in a 10gal, but they may be ok. However they need to be kept in a group of 5 or more otherwise they can/will be very skittish and hide alot.
2 ruby sharks - Too Big
And even with the fish that are 'fine' you'd be overstocked.
You're looking at a FULL tank with
1 Dwarf Gourami
5 Guppies (Stick to all males)
1 Platy
To answer your original question, I haven't a clue if 85 euros is a good price in europe (I'm in the UK), but it's roughly £80 and I wouldn't expect to pay more than £40 for a full set-up (second hand) in the UK. For brand new however that is a good price.
Ps. Keep this on topic guys. I know what you're all thinking...but all we can do is give correct advice, any 'comments' additional to that just end up in silly little fights as you all know! Lol.