if you had the fronts amped and the rears running off the headunit IMO you would be better not running any rear. At full volume a decent set of amped speakers will drown out speakers running off the head unit.
Why not do it this way, spend what you can now on the fronts then if you really want you can wait a bit and save up and get a set for the rear if you need them, but if you get a decent set up the front you should be happy with the output unless you want something that will cause permanant hearing damage.
Unfortunately you cant research speakers online like you can most other things, you need to hear them to know how they sound to you. Ive never heard of diamond audio so cant comment on them sorry. Beware of buying speakers online as there are fakes of certain brands going around, speakers is one of the few things i dont buy online.
Where are you located roughly? might be able to name some stores near you to go check out so you can listin to the difference.
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