I did type out a lengthy reply to this last night but my internet conection decided that a great time to take a nap was when I hit the submit button. :eyesup:
There are a number of kits available complete with low(ish) powered head units, stands, brolly and softbox that would be fine for a 1st time portrait kit. If you were looking at doing product work then you'll most likey need higher output heads as getting in close requires small apertures if you want to retain a decent DoF. Which in turn means that you can never have too much light at your command.
Obviously, with portraits you'll more often want to be limiting the DoF and with the lens open the light levels end up being much much lower.
Unless you really need new equipment I'd seriously recommend looking out for a 2nd hand kit. There are some great bargains to be found at places like jessops and Ebay. Jessops is more preferable as they usually buy stuff for next to nothing and dont have a huge markup. Plus you get access to stock from all their outlets sent to your local branch for viewing and they'll give a 3 or 6 month warrenty.
One area that is definatley worth spending a little extra on is getting a variety of reflectors and upgrading the stands of the ones you get as part of a kit are a bit flimsy. Good sturdy stands not only let you relax knowing that a small knock (or a little breeze if you're outside) won't see your flashes headign for the floor at high speed. They also make you look far more professional.
As to your original question (see I got there in the end

) the make of kit is not going to make nearly as much difference as what you do with it. If you are still shooting film then you'll need to spend a bit more on something that will give a consistant light temperature every single flash but with digital you can deal with any slight temp shift quite easily.
HTH a little
D
