I am unable to decide which frame to buy for fpv....
they all seem more or less the same to me....

is the tarot 300 mini a good option
or maybe the blackout 250 class
or H-King 250 class.

please help me out

Also suggest which fpv goggles are the best....like professional ones...not the diy ones..

Depends on the power/motors that you have and the use.

250 class is mainly used for racing. Go for 450 size if you want it for FPV slow flying.

You should go for a TBS Discovery/deadcat type frame for slow flying FPV. 250 are for acrobatics and racing.

Attitude V3 are good, I own them. Quantum V2 Goggles are also great.

I agree with Cycloned. TBS Discovery is a good larger FPV platform. If you're looking for a racer frame, the ZMR250 V2 from FPV Model is extremely durable and reasonably priced. I recommend the version without PDB as the full frame PDBs make repairs harder and the whole frame weaker. You can use a 36x36mm PDB with that. The main disadvantage is that it is relatively heavy, and is a H frame while the trend seems to be moving towards X-frames. If you tell us your budget and exact requirements from the frame we can make more informed suggestions.

TBS discovery ==> http://www.quadkopters.com/product/frames/tbs-discovery-x500/

regarding fpv goggles if you have budget and someone can get you the goggles frm outside india get dominator v3 they are the latest and the best in the fatshark series although there are some other companies too like skyzone and boscam depends on your budget and preference dom v3 costs around 30k with a good rx if you get it with someone coming from abroad locally in india we have boscam series with qk and rcmumbai i thnk pls check

also if you are looking for racing copters there are many frames available zmr is the popular one ..........

I am looking for a 250 class racer frame and I might actually have someone coming from US.
Please give suggestions on this: http://robu.in/product/h-king-color-250-class-fpv-racer-quadcopter-frame-blue/

Under 30k fpv goggles will be fine....I have viseo rx tx equipment and also quanum fpv goggle set already