No experience with the Rode but Sennheiser are generally top notch in my opinion for recording audio.
The 416 is pretty much the daddy but a bit rapha - i.e. pricey (but nice, and worth it)
So I'd certainly go with the 400.
I wouldn't bother with a lapel mic - wired or wireless.
Wireless are so prone to ballsing up. I've had countless interviews where they've gone wrong, either wrong frequency, batteries died, whatever - pain in the arse. And only really of use if the interviewee is either moving or standing up in a longish shot and you don't want to see wires.
Wired... meh. They can provide nice sound but if set up incorrectly can be more trouble than they're worth - rustling shirts are an absolute bastard.
If you had the budget to spend on a lapel mic as an optional extra as well as a top mic for your GH2, I'd invest in a good quality top mic. I'm not familiar with the GH2 - are there any direct audio inputs?
If not, then perhaps scrap the top mic altogether... I personally think the Zoom H4N is the greatest audo tool EVER.
It comes with two good quality condenser mics built in, not to mention the fact that it's a versatile 4 track recorder with two phantom power XLR inputs... (so you can either record good quality sound (perhaps not good enough for broadcast interviews unless you balance it just out of shot and are quite tight on framing but i'd say it was fine for web) OR you can use it as a recorder and plug in a hired 416 into it (10 quid a day from any number of hire houses in London) and get audio as good as you're likely to get.
No experience with the Rode but Sennheiser are generally top notch in my opinion for recording audio.
The 416 is pretty much the daddy but a bit rapha - i.e. pricey (but nice, and worth it)
So I'd certainly go with the 400.
I wouldn't bother with a lapel mic - wired or wireless.
Wireless are so prone to ballsing up. I've had countless interviews where they've gone wrong, either wrong frequency, batteries died, whatever - pain in the arse. And only really of use if the interviewee is either moving or standing up in a longish shot and you don't want to see wires.
Wired... meh. They can provide nice sound but if set up incorrectly can be more trouble than they're worth - rustling shirts are an absolute bastard.
If you had the budget to spend on a lapel mic as an optional extra as well as a top mic for your GH2, I'd invest in a good quality top mic. I'm not familiar with the GH2 - are there any direct audio inputs?
If not, then perhaps scrap the top mic altogether... I personally think the Zoom H4N is the greatest audo tool EVER.
It comes with two good quality condenser mics built in, not to mention the fact that it's a versatile 4 track recorder with two phantom power XLR inputs... (so you can either record good quality sound (perhaps not good enough for broadcast interviews unless you balance it just out of shot and are quite tight on framing but i'd say it was fine for web) OR you can use it as a recorder and plug in a hired 416 into it (10 quid a day from any number of hire houses in London) and get audio as good as you're likely to get.
Around 180/200 quid.
https://www.google.com/search?q=zoom+h4n&hl=en&safe=off&client=firefox-a&sa=N&rls=org.mozilla:en-GB:official&biw=1280&bih=670&tbm=shop