Thread: I need advice choosing a razor...

I think the razors listed are all hollow ground. I started with a 5/8ths hollow, and was a happy camper for many months. A 5/8ths might be easier to learn with, but there are many that start with larger blades so opinion will vary with an individual's experience.
While I like stainless, it may not be the ideal choice for a first razor. Opinion will vary on this also, but a carbon blade's edge will be easier to maintain.
Actually, I would advise you to forget ebay for a first razor and find one in the BST forum that is shave ready. You can trust the guys here, ebay is a lottery and chances are an ebay razor will not be shave ready unless purchased from one of the few really good ebay vendors. I will guarantee that Dovo Special is not shave ready just from the description, more than likely the Tennis is not shave ready either. Razors are not fit for shaving out of the box and these two were perhaps never honed. If they were it was so long ago that they would need to be re-honed anyway.
New users can encounter enough problems with a shave ready razor, starting with one that needs to be honed is almost too much to overcome unless you spend the additional dollars to send it out.
There is not much difference between the weight of a hollow ground 5/8ths and 6/8ths. Where the weight come in is for the heavier grinds. A sharp 5/8ths hollow will glide just fine.