Barry,I dont think its a good idea just to subscribe to a data provider just because it is the cheapest,you have to look at quality of service.When I was using esignal they had a few servers as back up,I've watched the prices stop for a few seconds and then the back up systems kick in.
They provide an excellant service.
If you liked e-signal you should have a look at infoscreen based on Realtick from www.ird.com . It has much superior charting and costs less than esignal as they don't have limits or restriction to stocks Only. You can mix unlimited futures and stocks and they have Level 2 + all the markets in the world.
I used to use e-signal but switched to this as it is simply a much in-depth + more professional service.