I ended up using a cheap crimper used for molex connectors, probably cost even less than the one above. The end of it had a flat section that I used to bend the seal crimp. Normally I spend the extra money to get the right tools, especially after dropping so much on various colors and gauges of SXL and GXL wire. In the end the cheap one worked ok. If I was wiring 100,000 cars, yeah I'd spring for the expensive one.
By the way, *do* get the right removal/extraction tools:
PICO WIRING 0660PT - Pico Pin Extraction Tools – SummitRacing.com
The clearance in the weatherpacks is so tight that any other non-weatherpack extraction tools just don't work
Do order all the various ga female & male contacts and use the right ones for the wire: esp 14-16 ga and some 12 ga (didn't use many 18 ga). Get the correct seals (green, gray, blue) and get some plugs (green)
One other gotcha: when I ordered from waytekwire, the order came incomplete missing one bag of contacts. They charge for orders less than some minimum, $50 I think, so it wasn't very cost effective to reorder the $6 missing item and pay the minimum plus another shipping charge. When I complained they said there's some way to tell if items are in stock when ordering online but I don't think it's obvious on their website. They can put your account on a "ship all items together" status if you ask. I ended up getting the rest off e-bay for about the same price, around $6 for a bag of 50 whatever (contacts or seals are about the same) - way cheaper than the lots of 5 or 10 contacts that summit sells.
Cheers