Reputable website for a new uni? (does seat post really matter?)

I know everyone says to go to unicycle.com to buy a uni, but I've found
one that (at least seems like it would) meets most of my criteria:

Torker LX Unistar
-300 mm seat post
-48-spoke
-front handle, rear bumper
-20"
for $99.98 at shop.sunrisecyclery.com/item/10749

I don't know if this is a model that will stand up to some rigorous
learning/experience-building or not (and any opinions on that would be
wonderful!) I also don't know if this website is reliable or reputable,
because I've never heard of anyone buying one from here.

ALSO: Does a 300mm seat post vs. a 400mm seat post make a huge
difference when you're learning? I'm 5'5", and it sounds like I should
get a 300mm, but some models only come in 400mm, and one person told me
that seat post doesn't really matter. I'm confused.



{{{{Some other models I was considering, in order or preference:

Semcycle XL 20" Standard
-300 mm seat post
-36-spoke
-front and back bumpers
for $165.00 at unicycle.com/shopping/shopexd.asp?id=535

Schwinn 20"
-350 mm seat post
-36-spoke
-supposedly more durable (flat-bladed)
for $139.00 at unicycle.com/shopping/shopexd.asp?id=59

Nimbus II 20"
-400 mm seat post [[this concerns me]]
-48-spoke
for $144.00 at unicycle.com/shopping/shopexd.asp?=740 or 739
It's also out of stock, and I don't know about the bumpers on this
one.}}}}


--
zambonijones
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