don't rule out bmw's - don't forget they made lots and lots and there are lots of alternative suppliers for parts AND bmw support older bikes. I never felt parts were expensive and you never get told its unavailable! lots of interchangeability of parts too.
look at early Triumph trophys - I just got a 96 with full luggage and 25k's for not a lot more than your 5 and they are around for 5. 96 model more tourer than earlier ones but came with panniers. still fun in twisty's and triple adds sound and character.
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