depending on what your looking to do really can't tell you what works best for a polo (screen print or emb) for polo's we usually do embroidery only since it looks a whole hell of alot nicer and with the buttons on the front of the shirt to do a left chest imprint you need to make sure you have abit more of a off contact then normal unless your look to do a back job. then I can see you looking to do screen printing since the buttons will be on the underside of the planten board and you can still have regular off contact you do when you screen print t-shirts.
As for the second part those shirts you mentioned all sound good. But, if you really want to do a really good polo your going to have to go to the higher end of the polo's. there are suppliers who carry nike, tiger woods and a whole bunch others that I can't even remember since I have sold some of the higher end shirts to people and they love them to death. have a look around and see what works. Here is what our embroidery teacher told us about 4 yrs ago. goes like this you have 2 sets of fonts books. with the amount of fonts out there you will have customers in your store for hrs looking over the vast amount of fonts. I usually make 2 books. one book has a bunch of general fonts. I would only take out the other book if the customer said I have this font I'm looking for. that is what you should do also. have the low end type of polo's for oh lets say a business and for oh lets say a golf outing or someplace that a lower quality polo wouldn't fit in but a higher end would that is what I have done and have had very good sucess with that.
