All three are good with the budget but there are few good speakers within this budget.
1. Bostan Acoustic A250
2. Onkyo SKF 4800
I have auditioned all units in past except Tannoy Eclipse ( have auditioned Tannoy Mercury )
Pioneer SP FS52 is the great speaker to own but have limited low end extension. Average build quality
Bostan Acoustic A250 is musical but little laid back . Very good build quality
Polk T50 warm sounding speake with limited high frequency details. Average build quality
Onkyo brand is famous for av receivers . Speakers have good low end extension but little bright in nature. Average build quality.
Have not auditioned Tannoy Eclipse
Final two units for me will be
1. Pioneer SP FS52
2. BA -A250
Both needs good sub for low frequency extension.
I would vote for A250, they are very refined and wholesome speakers. They are forgiving to the partnering kit also. They are extremely well built for the money and you will feel that you got a very good deal.