Stan I use GP3700 in my 2wd and they are more than quick enough, but if you go down the IB4200 route ( I use these in my 4wd) you will need to look after them more, where as the GP cells you can discharge them and forget about them.
With the IB4200 cells they lose around 300-350mah a week while sat in your box, so you need to discharge them at home after a meeting and put 9 minutes charge back in them, this will ensure your cells don't dead short and will be ok for 2 weeks.
You also shouldn't put these cells on a discharge board like the LRP/Nosram ones, where the voltage cutoff is lower than 0.9v per cell, The Novak smart tray or the new Trinity DPD dicharger are both ideal as you can set the cutoff voltage, and both are around the £80-90 bracket.
Also you shouldn't repeak the cells before you race so time your charge right, and as long as you let them cool down you can use them twice a day.
HTH
Brian
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