Hi,
The schemes that you have chosen are both technically and fundamentally strong. Here is a strategy that I would suggest for Rs. 5k per month.
Have SIPs for Rs. 1500 per month, in both HDFC Top 200(G) and in Birla Sunlife Frontline Equity(G).
Sundaram BNP Paribas Select Midcap(G) allows you to have a minimum of Rs. 250 per month. So, take an SIP of Rs. 250 per week (which will be Rs. 1000 per month). This will further dilute your risks. You can also have an SIP for Rs. 1000 per month in DSP Black Rock Equity Fund(G).
Have all these SIPs running for atleast 3 to 5 years. So, at the end of the five years, you will be having a large cap diversified core portfolio and a comparatively smaller mid cap portfolio. Later, you may look at rebalancing your portfolio.