Intermediate board advice, retro or recent?

[antekozina3]

"slinky" "GURGLETROUSERS" Thanks

I must admit that I was impatient and perhaps too self-critical.
This year I sailed just 3 times. Picture in the post where I sail was taken in water temperature 16-17 * C 13/04/2016. Now it's summer and I went to surf just 2 times. The first time I sailed with a sail of 6 m2 and in 2 occasions 30-35 min(wind 5-9 knots). Shredder is a great to go upwind. The second time I had sailed only 30 minutes in the waves of 40-50 cm and a little stronger wind around 15 knots. I did it twice plane and I felt the tail of the board to cross the wave'' A little unstable, but I no longer have as much weight on the back leg and I am satisfied with how I balance.
The next step it is planned that tomorrow, in the wind of 10-12 knots, trying on harness and on water remain at least 60-90 min.
It's no rush, but if I buy recent board of 155-175 lit. I learn all a lot faster.
I think I bought the biggest board that I could afford and that is not in bad shape. Shredder started to be fun, I just need to connect several waves
My mast is old 465 cm and DIN 7.3 (IMCS 26), and boom is up to 200 cm. I have already informed my self on the bigger sails. I follow ads.Used sail can be ordered from Germany. Delivery should be around € 50.
I have yet to master the harness and footstraps. Its better that the equipment is older and I'm not sorry if anything breaks. It is essential that everything is going slowly and that is no injuries.
Sorry if the post is not absolutely clear. To draw up a post I used google to translate

[antekozina3]