seriously if your new and this might be your first bow then do buy anything thats too heavy,, why? because by the time you buy the bow plus a 2nd set of limbs you will have paid too much for a bow you can shoot decent,, unless those heavy limbs are practical and not way too much weight.
widows are nice bows but take the above advice go to the widow wall and look in the classifieds section,, Blackwidow allows used widows to be sold there you will find many sets of limbs to put some prices together.