I went with the 4500(same as 4000 but with bigger spool)because as you state, the 5000 and 6000 are pretty heavy!
The GT spool that JPowers referred to are made only for the 5000 and 6000 unfortunately. They have a smaller lip for better casting, although guys on this site that have used the standard spool state that it still casts very well.
The manual bail is nice so its one less thing to break.
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