Islabike Beinn 20 alternatives?

I'm looking for a new bike for my daughter, who will be 7 in 4 weeks time.
I was initially considering either the Frog 55 (£255) or Islabikes Beinn 20 (£329) but I'm not sure exactly how much cycling we will do, we're still doing up our house and I'm not going to let them roam on the streets on their bikes yet - in other words it will be organised rides with me accompanying them.
I know with an Islabike, I could expect to get back around £180 plus, 2-3 years later when I sell it, so it's the best bet from a resale point of view, but what about other alternatives?
I appreciate they will all be heavier - but given the fairly limited riding we will do, what other options are there, that aren't stupidly heavy?
I know most of their bikes are in a different league, but I can get about 23% off prices at Halfords, so could pick up a Carrera Luna Girls bike for about £155:
http://www.halfords.com/cycling/bikes/k ... 4--20#tab3
I know it weighs 13.5kg. I need to work out how much value I would place in my daughter having a much lighter bike (like the 8kg Islabike) for an occasional ride.
What other options are there? To me, unless I can pick something up around the £150 mark, I may as well get the Frog, or stretch to an Islabike.
Any help, advice or experience would be much appreciated..
I was initially considering either the Frog 55 (£255) or Islabikes Beinn 20 (£329) but I'm not sure exactly how much cycling we will do, we're still doing up our house and I'm not going to let them roam on the streets on their bikes yet - in other words it will be organised rides with me accompanying them.
I know with an Islabike, I could expect to get back around £180 plus, 2-3 years later when I sell it, so it's the best bet from a resale point of view, but what about other alternatives?
I appreciate they will all be heavier - but given the fairly limited riding we will do, what other options are there, that aren't stupidly heavy?
I know most of their bikes are in a different league, but I can get about 23% off prices at Halfords, so could pick up a Carrera Luna Girls bike for about £155:
http://www.halfords.com/cycling/bikes/k ... 4--20#tab3
I know it weighs 13.5kg. I need to work out how much value I would place in my daughter having a much lighter bike (like the 8kg Islabike) for an occasional ride.
What other options are there? To me, unless I can pick something up around the £150 mark, I may as well get the Frog, or stretch to an Islabike.
Any help, advice or experience would be much appreciated..
2012 Scott CR1 SL
2013 Dolan Dual
2016 Boardman Pro 29er
2013 Dolan Dual
2016 Boardman Pro 29er
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Plus we picked her's up on Gumtree for £50(immaculate condition) plenty on there on Ebay around that price plus then if she didn't ride it it wasn't a drain on our finacial resources as much.
2013 Dolan Dual
2016 Boardman Pro 29er