end of day data provider

[Scaletrade@xxxxxxx]

I am in the process of switching from realtime data (FutureSource) to end of 
day data, and I'd like to ask the group which providers are compatible with 
TS4, and what the advantages/disadvantages are.  Obviously convenience, cost, 
accuracy are all important, but most of all I'm trying to stay with 
TradeStation if reasonably possible.  

Thanks in advance.

Larry