There is more to than your weight to factor in when deciding on a frame. Does your pedaling style lean toward spinning or mashing? Do you do a lot of climbing or riding into strong headwinds? Do you like to sprint? How do you prioritize comfort vs. a super stiff feeling frame?
If you really want control over how the bike feels, you have to go custom and find a builder who will design a frame with tubing that matches your riding style and personal preferences.
Otherwise, you should find a shop that has a bike in stock, or someone who owns one that you can test ride, even if you have to drive 100 miles.
For the Helix 175 should be fine, I'm 213 and I can tell you that it is too flexy in any situation, but i'm way heavier, I recon that should be rider weight range that would allow the Helix qualities to shine best, Light and confortable ride.