Originally Posted by whisper
Is there anything I have missed here and will the £250 - £300 cost be worth it?
That setup will work nicely.
You should be able to pick up an Icom for about 120 pounds and a Garmin 72 for about the same, though a nearly new one changed hands on here for 50 quid recently.
The 72 has been replaced with the 78 by the way, priced around 200 pounds.
If you have got room for the 72 on its mount then you might just be able to fit a 451 (proper fixed plotter) in the same spot?