Depends on how much flash power you need and if you can up the ISO a bit higher to reduce the flash power.
To speed up the recharge time I've been thinking about these batteries.
link
You can't get them in the EU, at least I haven't found a shop here that does.

Thank you Paul, they have something that I want and they have it very cheap, that's why I'm asking

Thank you Tony

Just look at a sport event and I'm sure you will see quite a lot of people with a monopods and such long lenses.

He does look a bit yellow though

I wonder why you call them gnome and we kabouters, most of the time the name of mythical creatures share at least some relationship. Does some one know the etymology behind the name(s)?

Have anybody here has experience with this store? http://www.hiltonphoto.co.uk/contact.phtml

You weren't putting me down Don, don't worry.
I was just sad I didn't had the flash power to do it.
Studio strobes would be a great solution but it's too big/heavy to carry around to be honest and portable versions tend to cost a lot

For €60/€70 (found a cheap shop) in total I should be able to get cabled flash set-up running with one flash, I would simply get a Metz 48 besides my current flash and that should do it.
A good thing is that you can control the overall flash power from the camera which could be helpful.
Also I ain't cheating the system so when I do get a 645D I could use the flash as well (keep on dreaming).

Just thought about that I could use a F5P cable to trigger the AF540FGZ and let that one trigger another flash and all in HSS

£126.82 for a cable

hmm why is this cable only $67.45 in the US?
the funny things is someone wrote that's a high price on Amazon

Here I am - this is me
There's no where else on earth I'd rather be

Great title Dario and welcome to the forum

Better colours (they say) and who wouldn't want bling bling today

Oh forgot a suggestion.
Do you want something wider than 18mm if so how much?
The DA 16-45 is regarded as a great lens and relatively (what a word) cheap.