[jyl]

Z -

Get the Cycle Force Mantis Eagle. It is the only rigid bike on your list (neither front nor rear suspension). That means it will be lighter, more efficient, and more reliable. You do not need or want suspension for your usage, at this price point: your legs and arms absorb movement more effectively than the crap springs on a low-end bike, and won't fall apart after couple years (or months).

I don't see a choice of sizes. If I recall correctly, you are a fairly tall and big guy? If so, the Mantis fit should be okay, even if maybe not ideal.

Go over the bike carefully upon receipt. Inexpensive bikes are often incorrectly assembled. Everything should work crispy and effectively and pretty much silently. Squeeze adjacent pairs of spokes together, they should be tight and consistent tension (not much more than 1/4" deflection, using a really hearty handshake sort of grip force). If something doesn't seem right, ask here or check out the Park Tools maintenance guide online.

Accessories: helmet, U lock, spare tube, patch kit, tire levers (2), pump. Blinking red taillight and blinking white headlight (often sold in a set for $35) if you will be out after dusk.

Careful on the roads. You are even more invisible than a motorcycle and some drivers think you don't even have the right to use their roads. But don't ride on the sidewalk, at least not when there are pedestrians there.