I've got several. Among them are various Ikons (slant etc.), Henson, Razorock slant, Hone, Seygus, Standard DEs (of which I have four, two black and two silver, with one pair unused), and Colonial, Mongoose Alumigoose, Focus Dynamic and Razorock SEs.
I like all of them, especially the Standards, and the Ikons, which were among the first that I bought. They are, of course, lighter than stainless, but rather less expensive than titanium.
To my mind, among the makings of a good razor are a well-designed head, good balance and the right length of handle. Provided that an aluminium head is a "good one", and the screw thread is the standard M5, it's easy enough to tune that to suit personal preferences by using a different, and usually stainless handle in place of the original aluminium. I have several different third-party handles to use, but curiously I have been able to find only one in aluminium (to experiment with on a stainless head), and that's no longer available.
There are makes other than those I have mentioned, and some of mine are no longer produced nor are they available from UK suppliers. I have bought most non-UK items direct from the makers in North America.
On the question of bakelite/plastic razors, the Phoenix plastic ones are good, although the colours are a bit strident. I have one of their restrained brown ones. Merkur also made a #45 bakelite, but I'm not sure if that's still available. If you're interested in vintage, then Wardonia razors might be worth a look, although DE blades have to be adapted to fit in them. There's also a modern Dorco plastic DE.