Lock-in Parts
First, love the site! Great job!
There can be some pretty big differences in just moving the slider 1 tick... just pulling numbers out of the air, a $700 build might have an awesome GPU but moving the slider up to $720 downgrades the GPU in favor of a better CPU, case and an SSD. I recommend adding the ability to lock-in parts we like and force the selection of that part.

This is a pretty good idea, as well as the option to remove parts.
Ill consider adding this if the demand is there.
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Chris Reeves commented
I love this idea. The way it arranges things under some pricing scenarios seems very random. You should be able to say "I want this chip, this case, this much storage" and have it build out the rest for you.
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You can actually already adjust and remove the storage options by clicking the icon next to them - this includes SSDs.
However I would highly recommend the inclusion of an SSD in your build in the areas ChooseMyPC advises them! They make a big difference to real world speed and responsiveness
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Anonymous commented
Great idea, I was thinking of that too. I would rather have a cheaper SSD for boot up and spend it on the GPU but pushing up my budget causes an upgrade to the SSD which I do not want.