If 4xx$ is not that much for you and that you are ready to let it stay in your wallet (not on an exchange !), yes, that could be the best investment you could do in your whole life. In a few years your investment could be double, tripled or even quadrupled ! You can still buy a fraction of a Bitcoin if you don't want to put too much money just now, but the earlier you buy it (so the cheaper), the better it is.

LOL now you've really got the bug already!
It's not so much about the money for me, although that's potentially very nice, but look at it as a 300 quid adventure.

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The Op has asked for input and made his decision. This thread is now redundant.
All posts from now on, especially carrying paid signatures, should be treated as post count spam.

If you have enough money to buy 1 bitcoin and you are happy to do so they why not, if you need to go without anything in order to buy 1 then it probably isn't a good idea, just buy a smaller part of bitcoin maybe half or a quarter, should never leave yourself without.

You should know this yourself!
Are you a risk taker? Is the money you would invest to buy a whole Bitcoin affordable for you?
How long have you planned to hold this Bitcoin?
You can ask for as many opinions as you want and you will get always different answers.
In the end you are the one who has to make the decision!

I dont think it matters that you buy a whole coin.  Some people new to bitcoin have this facination with whole coins.  Just buy as much bitcoin as you can afford.  about 2 years ago i told my brother about bitcoin and he wanted to buy, so i advised him to get in slowly.  Purchasing a small amount every week or month, but he couldnt get his head around buying 0.5 or 0.25 bitcoin, which in my opinion cost him because he bought in at £600 per coin and it has yet to get back to that valuation (i do believe that some day it will be worth far more and ultimatly he will be in profit)  if he had spread his purchase out over a few months it would have saved him some money.

Either way its up to you, good luck

PS:  if you are new to bitcoin research bitcoin security first and what wallet you wish to use to secure it, my opionion would be a paper wallet backed up in atleast 2 places if its long term storage or something like breadwallet for iphone if your looking to speand it.  heres a great link:  https://youtu.be/I1uefzJJ6nM

i have a feeling next year will be a great year for bitcoin so go and buy many many more bitcoin if you can. and it is always gd to have one whole bitcoin. the feel is so different.

I think you are talking about 1 bitcoin, if you have enough money than you can buy 1 bitcoin right now without thinking much as price is some dollar low than usual. Best time to buy.

Congrats and thats a good decision the price will increase thi following year so keep holding or if you want to increase your bitcoin
Or make a profit you can try find a job in services section while your waiting for the price increase.
Honestly the price of bitcoin that you bought is cheap than buying it now in bitstamp.

At $420-$430, it is. We can only go up from here.