I'd go for the samsung hd as it is £2 cheaper and is suposed to be much quieter. If your overclocking you would be best getting better ram such as XMS2. Finaly I think you should buy the e6300 and get a better motherboard to overclock it with
Edit: Didn't see your last post. The Gladiator has a better graphics card but the ram is probably terrible as is the motherboard. However, if you cant be bothered to build it the gladiator might be your best bet. Just remember that you wont get a very good overclock out of it