It's all relative.
PP large figures are a combo of pewter and resin, thus making their cost skewed. I think the Riptide is a touch smaller than these.
The Riptide is shorter than the Trygon, if that tells you anything. You can also get Master Grade Gundam kits (1/100 scale gundam models) for about $65 USD. These kits can be from 5" to 12" in height determining on the unit they are based upon.
I plan on running that as mine someday. Probably just buy those sooner than later just to futz with cause they are cool kits that blow
GW stuff out of the water (twice the bits/sprues, full articulation, makes a
GW kit look like BABY STUFF, i.e. it's hard mode).
http://www.amazon.com/Gundam-FA-010S-Full-Armor-Scale/dp/B00030EVGQ
Just my $0.02.