The Vandersteen have a very unique warm/dry type of sound, mostly due to the combination of a poly mid (warm sounding) and the coated metal tweeter (contributing to the dry sound). If you love that sound, that’s great! The Vandersteen 2c looks to have a used value of $500-600 a pair. The 2ce looks to be $1400-1600 a pair. You don’t necessarily have to use a full range speaker for surrounds, but it definitely doesn’t hurt. You could use two of the VCC-1 center channel speakers for surrounds, but they are $850 each, so you are actually doing better by getting a set of 2ce for surrounds. So, four 2ce speakers would be very nice, and since they are perfectly matching, the sound will be very cohesive around the entire room. As long as you get a matching VCC-1 or VCC-2 center, you are good.
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That being said, the 2ce is a rather low efficency speaker -- it’s only 86db efficient. Also, the impedance drops down to 4 ohms in the sub bass area (30-60hz):
https://www.stereophile.com/content/vandersteen-2ce-signature-ii-loudspeaker-measurements--
If you wanted to go the Vandersteen route, I would highly suggest getting a really good external 5-channel amp because the receiver just won’t have the power supply to push these Vandersteen effectively. Essentially, the receiver won’t get the volume and will suffer in bass power/strength (this may cause you to think you need subs).
For these specific speakers, you really want to get a 5-channel amp that has a massive power supply. I would also not recommend a warm sounding amp because you want the most amount of attack/resolution for home theater (and the fact that the Vandy are warm sounding already). The smaller amps (such as 100 x 5) would not be as good, in my opinion.
Looking at new, the Emotiva XPA-5 Gen 3 is probably the best you will do for the money at $1599. Used, there are options, but they can definitely get expensive. The Emotiva Gen 3 uses switching power supply, but it does have enough current to drive your Vandersteen.
There’s a Krell Showcase 5 on audiogon/tmraudio for $1599. It will definitely be fast and resolving, but may not have the power supply to give you good strong bass.
We can discuss more if you want to explore this direction.