So you're in the market for a used boat and you've come down to two very different paths: a 1990 Supra Mariah that looks ready for the water, and a 1989 Proline that needs work before it goes anywhere. One asks for a serious budget up front; the other asks for your time and skills. Here's how to decide between them.
Quick verdict: If you want to spend your weekends skiing instead of wrenching, the Supra Mariah is the one to choose. It's a one-owner boat that's been stored indoors, inspected by a dealer, and refreshed with a new gel coat, new rubber rail, and new trailer tires. If you're the kind of person who enjoys a restoration challenge, the Proline offers a far lower entry point and a project you can make your own.
| Product | Price | Condition | What to expect |
|---|---|---|---|
| 21' 1990 Supra Mariah | USD 8,000 | Used; dealer inspected | Ski boat with inboard engine, composite hull, fresh-water use |
| 1989 Proline | USD 1,500 | Used; non-running | Needs wiring and fuel system work; engine turns over |
Where the Supra Mariah wins: It's the turnkey option. The boat has a new gel coat, new rubber rail, and the upholstery and carpet are described as good. Power comes from a 351 PCM Cleveland block inboard with 785 hours, and the trailer has new tires. With a dealer inspection already done, the list of immediate unknowns is much shorter.
Where the Proline wins: It's the project option. The hull and engine are there, and the engine turns over, but the wiring and fuel system need attention. If you have the know-how, you can inexpensively bring it back to life. The trade-off is that it's non-running right now, so you'll need to plan for time in the garage before any time on the water.
21' 1990 Supra Mariah Boat
Choose this boat if you value being able to use it soon. The one-owner history, indoor storage, new gel coat, and new rubber rail all point to a well-cared-for vessel. The 351 PCM inboard engine is paired with a composite hull, and it's designed for fresh-water use. The drawback is the $8,000 asking price, which is the higher end of this comparison. You're paying for the convenience of a boat that's essentially ready to go.
1989 Proline Boat
Choose this boat if you want a project and a much lower entry price. The engine turns over, which gives you a starting point, but you'll need to address the wiring and fuel system before it runs. That's both the appeal and the challenge. If you're confident with electrical and fuel work, this could be a rewarding restoration. If not, the cost and hassle of the repairs could quickly add up.
Final choice by use case: For the boat owner who wants minimal surprises and maximum water time, the Supra Mariah is the match. For the do-it-yourselfer who sees a running boat after a few weekends of work, the Proline is the one that fits.
