the kona 2 takes in hd-sdi, sdi or dual link hd. an IO would do the trick. the IO has everything in and everything out, so analog to sdi is one of the many functions you can set it up as a stand alone in fron tof the kona 2. i have not paid too much attention to the other product, is it shipping AND working? if they can get you analog to sdi and you feel comfortable, go for it.
you can keep the ul3d, just when you work with uncompressed, you will notice you are bumping your head. it chokes the bandwidth now available and necessary with the ul4d, you will think you have a whole new drive. if you are working compressed DVCPRO HD, the ul3d will make no difference.