Hi Geoffrey,
I recommend taking a workshop before making any purchase decisions. That will give you access to a few types of sleds, arms, and vests. While the workshop rigs are usually all under the Tiffen umbrella, other rigs (and typically other vests) do appear. You'll also meet a lot of operators who may own other brands of gear, or know operators in your area who do, and may let you try it out.
Overall, try before you buy! See what works for you, and know the camera payloads that are used in your market on the jobs you want to be doing. Larger union shows might have beefier builds that is pushing it for an Archer setup, though small corporate work might have smaller cameras that are perfect for a mid-size setup. It's possible to fly larger builds on an Archer, though make sure you are not constantly overloading the sled (Archer or whatever you go for), as it can cause unseen damage over time.
Happy flying!
Lisa