What part of the Kirby is bent? It's most likely the nozzle, you can always buy another nozzle and pop it on! Your Legend II will provide WAY more than 10 years of reliable service, plus it should already be capable of taking the newer HEPA bags (if not, the conversion is VERY easy).

Don't be foolish, Parts are available all the way back to the 500 series! Belts and other parts will be available for decades to come (And if not, I'm going into the replacement parts business!). I actually used the Heritage I set-up on my Classic III last night (the F&G conversion kit blew it's zipper!). You can use the kit off your Heritage II, or purchase an F&G kit. the kit is not all that bad, I wonder if it can be converted for use with the modern ST bags (Replacement to the F&G series).