best stocks ISA

[KarlosKKrinkelbeim]

looking to use my entitlement for this year and not had a stocks ISA before.
DH is with L&G but I think there must be lower cost options. Want to invest in a diversified (in terms of geographies and asset classes) range of funds and keep charges to a minimum. Also making a decision in something of a rush (!) so may want to transfer out at some point.
all recs gratefully received.

I have previously used Fidelity
Now using Hargreaves Lansdown - their website/process stuff is easy to use

I've just signed up to Charles Stanley. Finding the website reasonably user friendly and recommended by moneysupermarket. But I am a complete newbie to the whole thing so can't really comment on the range of funds. Charges seem reasonable to me (£10 per trade? I can at least get my head around that! Plus up to £150 for fund management I think).