Thanks MattyB. Battery failure/dodgy receiver is a fair point which I hadn't considered. The future proofing side of things is less of a concern as I realise this might be just a foray into the activity for me - and I may decide that I don't want to go beyond a certain level (or, heavens forbid, give up). Am sure there's the risk of days on a damp, cold, windy, field thinking "there must be something else I could be doing"..... and I could just become demotivated. At this stage having lots of buttons, switches and dials is actually off-putting rather than inspiring. If it turns out that I become totally hooked on it then I'll take the hit (financial and time) at that point.