The older Britainia series B1, B2,B3 are the ones to find, the new ones are not built as well. Company has really changed over the last 5 years or so...and not for the better.
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To answer your specific question about the REL models you're considering - Yes, the R series subs are a step above the T series subs. They are also very different in that the R series uses Class D amps while the entry level T's use Class A/B.
The R series has been recently replaced by the S series.
Whichever REL you choose, they are great subs and a good choice if music is your first priority. Hope this helps brother.