buying new desktop pc at akihabra

my money is only 5-6–œ
i plan to use it for online gaming, surfing net ,watching some hd stuff...
i would like it to at least have some decent video card like nvgeforce 9400.. stuff like that
and at least 500gb space ..

is it possible or my budge to low?

oh and for monitor it would be great if it come with a new one but if not i have my old one ...

How about looking secondhand store Sofmap or BTO small shops like DosPara, Faith, Clevery, Tsukumo, Storm, PC-Koubou and so on.
However maybe they can speak Japanese only.

I don't know how pricey hardware is in Japan, but the equivalent in dollars is more than enough to build a decent pc and a monitor.

Few pieces of advice:
- A 9400 is utter crap, it's 5 series old and at the bottom of the well as far as the 9000 series is concerned.
- Pre-built computers you buy in shops are most likely going to have a bad price/quality ratio. The best idea, if you can find a technician or somebody at least a bit experienced in computers, is to buy the parts yourself and have someone build it for you. It's actually very easy to build it yourself, but if it doesn't work for some reason then it's going to be bad unless you have a clue of what you're doing.

If you still want to go for a pre-built, do some research online to see what's a good configuration for your budget, then go shopping and look for the pc closest to the specs you've found.

is this a good video card
SAPPHIRE HD6450 512M GDDR5

better than geforce9400?

Yes, the Radeon HD 6450 is better than the GeForce 9400. Video cards are often difficult to compare because bigger number doesn't always equal better, and the Radeon and GeForce cards have different numbering schemes.

Tom's Hardware has a pretty handy hierarchy chart for GPUs, and they list the HD 6450 as 6 notches higher than the 9400. http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7...

which is better
intel(r)core(tm)2Duo cpu e8500 @3.16ghz 3.17ghz
or
Phenom II X6 1065T 2.9ghz

oh and this to pls compare
Core i5 2320 3GHz

the i5 is very good, although a bit pricey for your range.

generally with videocards you have to look at the number: let's take the 6450 as an example. 6 is the number of the series, so generally the higher the number the NEWER the card. the next numbers tell you where the card is "placed" in that series. So a 6890 (which I don't know if it even exist) is better than a 6450. At the same time, a 4890 (older, but at the top of the 4 series) might be better than the 6450 despite being older. I'd suggest an ATI HD6770 or better, or an nvidia 550GTX.

I don't know Japanese prices because I live in Kazakhstan, but here some starting point:

CPU: Intel Core i7 2600K
Motherboard: ASUS P8Z68-V PRO
RAM: 8GB (2x4 kit) Transcend
HDD: Western Digital 5400 rpm SATA-III 750 GB
Video: NVidia GeForce GTX570
Sound: Creative SB X-Fi Titanium
Monitor: Acer 24" 1920x1080 G245HAbid

It will be well above average gaming PC. If it is too expensive, you can change Core i7 2600K to Core i5 2500K, avoid using external sound, change motherboard to ASUS P8Z68-M PRO and change videocard to GTX 560Ti.
But, of course, in that case your PC will have slightly less power.
But if this also too expensive, you can step down to GTX 550Ti, but keep in mind, that 550 have only 192-bit memory bus width (against 320-bit in 570). It will drastically degrade 3D performance due to memory bandwidth (152 GB/s in 570 against 98 GB/s in 550, i.e. 570's memory runs 64% faster)!
And you can go even further changing CPU from Core i5 2500K to 2320, but you will get locked frequency multiplier, so this CPU will have less overclocking potential (letter "K" in CPU label means "unlocked frequency multiplier", that kind of processors is the most expensive, but have huge overclocking potential. With right cooling system you can achieve 4.2 GHz, and even more, in Core i7 2600K without any overheat).