Well, I can certainly make some recommendations for steel trainer swords.
The cool thing is that there are many choices available these days, many of which are pretty decent. No longer do you need to buy a crowbar on a hilt, which are not only inaccurate historically, but also dangerous to use. Appropriately weighted trainers can be used relatively safely.
Some options (click names for links):
Tinker Longsword: Sir Brian can talk more about this, since he has one. My impression is that it's fine for the price, but if you're willing to spend more you can get much nicer trainers from A&A and Albion. It boils down to budget and personal preference.
Hanwei Practical hand-and-a-half: This one is very good for the price. In fact, it's so light and small that it works better as a single-hand trainer than as a longsword. For single-hand use, I like it better than the Hanwei single-hand trainer. The edges are a little thin for use as a longsword, so I'd avoid using it as a two-handed trainer if you're going to use it at speed against people just wearing fabric and padding.
Albion Meyer: This is one of my favorites. It's one of the most expensive, but has a fantastic feel. It's light and agile, durable, and just the right amount of flex for free-play including thrusts. Nice thick edges. My only issue is that the guard is wide enough to get in your own way at times, but that can be adjusted for in your technique.
A&A Fechterspiel: A little more affordable than the Albion Meyer, this one is slightly more blade heavy and less agile. But still quite good, and representative of this sort of longsword. It has a little less flex too. So this one is actually better for Harnessfechten (armored combat) in which you need it to be stiff for half-swording techniques. It has nice thick edges and is extremely durable. So depending on what you're doing and what your budget is, this is an excellent choice.
A&A Scholar's Sword: Another great training piece from A&A, this is their single-hand trainer. Slightly more blade-heavy than the Hanwei hand-and-a-half, but very appropriately weighted for single-hand swords. Durable, and looks the part. Hard to go wrong here.
