Nice bike!
Just my .02 here but you can easily convert your bike to a 3x and it would be much cheaper than a new or new to you bike.
If you like the way the Raleigh rides just pick up a triple crankset. A quick check of fleabay shows several Sakae triples and there's even one in my preferred 48/38/28. Putting a triple on will require a new bottom bracket and you might need to swap the RD for a longer cage version and the FD for a triple if your current one won't swing far enough. That said if you take care not to cross chain you might not need a different RD.
Doing a drivetrain upgrade with good used parts will be the cheapest option IMO.