I'd replace the AL fork and assuming you'll re-use the existing headset and stem you want a 1'' threaded chrom-moly steel (or carbon-fibre if you want to go that way) fork with a steering column exactly the same length as this AL fork has...take it out and measure from base of fork crown to top. If you get one just a little longer you can use HS spacers to fill the gap.
There are some cheap Chinese chrome-plated forks that look pretty good but are heavy and have way too much threading on the columns, which weakens the steerer, but they only cost $40. I'd get something better for this bike, but be prepared to search a bit cause there's more demand than supply...1" threaded carbon-fibre forks are a little easier to find, but rather rare, too...easiest thing to find is a 1" unthreaded replacement CF fork, but then you'll need a new Aheadset and stem.
Hey, nice bike!