Ricc,
Keep in mind that what you are feeling, except for the heft, with Trent's handles is the plastic sheathing. not the aluminum. After you get a couple like Trent's, you may try a Thompson handle and decide that what you want. Then there will be the xxx... I have at least one of all of those and more.
We've all been there.
I would urge you to consider the pride of craftsmanship you will get in creating your own out of wood since budget is a big factor.
You can buy aluminum stock that you could machine yourself, but after all the small quantity purchases, they will likely be as expensive as buying them from Trent.
I took to making my own R8 collet handles out of repurposed schedule 40 pipe, some texturing webbing, and shrink wrap. I gave it up and would not do it again.
The bottom line is to go where you will find your own satisfaction.