Now, roughly speaking, you are paying 20% income tax until €33,800 income, and 40% after that.
The pension contributions are done pre-tax, so for the higher tax balance, you are getting a good deal paying €60 to get €100 invested.
€35000 minus 5%, drops you to €33250, below the standard rate cut-off point, so any additional contributions would only get the 20% tax advantage, costing €80 to invest €100.
Capital gains aren't taxed in the pension, but management fees are greater than what you could get from a low-cost broker on the market. You will still have to pay tax on pension withdrawals as income.
It all your decision in the end, and noone knows the future but it might be a better idea to get some some of those pathetic regular saver accounts we have ( check the best buys section of this forum) and continue building up like €40k for a house.