Pascal's Prog Journey

VdGG: Godbluff and Still Life serve well as starting points. From Gentle Giant I'd recommend Free Hand or Three Friends. Keep away from In a Glass House until you have acquired the taste.

My experience with VDGG was that I often needed several spins to get used to their albums. Many find Hammill's voice uncomfortable at least in the beginning. I had the same experience at first but got into it with time and now they're one of the top acts for me. Also there is some unconventional mixing on some albums that makes the sound seem strange in the beginning, but again, one can get used to it and even appreciate it.
I'd go for Still Life first but with H to He (...) or Pawn Hearts you won't go wrong either as far as I'm concerned.
But whatever you try, give it some time.

Gentle Giant - Acquiring the Taste
VdGG - Godbluff

Good to hear, I'll try Awake.
I also thought of trying more of eclectic prog, either Gentle Giant or VDGG, but not sure yet where to begin. Which album(s) of their top period is the easiest to get into?

I'm getting more and more used to heavier rock music and am listening to a lot of King Crimson and Dream Theater these days. I know that the latter is not a favourite of everyone here, but their music is done with so much energy and contains a lot of detail, got beautiful sound and syphisticated rythmics. The solos are hit or miss, sometimes they mix melody and virtuosity brilliantly but sometimes it's downright boring- playing random fast notes. I can add the album Black Clouds & Silver Linings to my list now with an 8.

Agreed with both. I guess they added Through Her Eyes for the listener to "rest the ear" from all the heavier parts, it's not a bad thing, but they could've done it much better.

Filling some gaps, which are all great albums. Two double albums, The Lamb from which I like some parts very much but it's very hard to listen in full if it draws to the end. But the best moments are of equal quality of Selling England. 

Hmmm... The only lists of big 6 I can find on the internet are those I mentioned...

DDPascalDD wrote: @ALotOfBottle: I quite liked the first Samla track, quite accessible indeed, but the second one was less to my liking at first spin. I could give the album a try!  @Guldbamsen: those two sound very interesting, but I think I need some time to get into it. In general my plan is to finish off the big 6 and then move on to more avant-garde stuff or anything really different that I haven't tried yet, maybe krautrock, bands like Gentle Giant, VDGG, anything.

As to avant-garde stuff, I would discourage from starting with avant-prog and RIO right away.
How about building your way up with Canterbury scene? If not, than VDGG will be the best option for you.

I've never tried Jethro Tull, but in general the 'big 6' are Yes, ELP, Genesis, King Crimson, Pink Floyd and Jethro Tull (at least that's what I thought). But one defenitely doesn't have to agree.
Tull seems to be not too hard but has some very good albums every progger should know (at least TAAB and Aqualung).