Thoughts on the various platter materials used in Pro-Ject's midrange turntables?

@lewm 

I do not believe any of them come with a mat, but that could be purchased separately.
 

I’m open to recommendations for turntables in that price range (approx $1500-$2800) if you have any. 

I think I was a little too emphatic in my statement about Pro-ject. They seem to have many satisfied users. I am no expert on mid or low cost belt drive TTs.

IMO the weight of a platter is a very important consideration.  What do each of these weigh?  On acrylic and vinyl, you may be better off without a mat.  It's worth trying.

He’d have to buy two turntables to try two different platters.

@melm Unfortunately, the only weight info I could find is on the acrylic platter on the X2: its 2kg and 30mm thick.

The description given on the Classic Evo aluminum platter is:

"The heavy aluminium main platter construction utilises advanced thermo plastic elastomers (TPE*) for optimising resonance behaviour. A drawback for most of the old designs was the platter. Casted platters all have been heavy (which is good for speed constancy and low wow and flutter) but suffered very much from ringing effects which again caused colouration of the sound. The platter of The Classic EVO is precisely machined out of a special aluminium alloy again damped with TPE*, which offers special damping abilities." 

And here's what they say about the 6 PerspeX SB - Vinyl/MDF sandwiched platter:

"The resonance-optimised platter is a sandwich construction utilising a fine-balanced medium density fibre platter and a 4mm thick flat-ground layer of vinyl and a screw-down metal record clamp. It runs on an inverted bearing with stainless-steel axle carrying a ceramic ball/plate bearing."