Yes, do you want to travel into Euston, King's Cross, St Pancras, Tottenham Hale or Liverpool Street? Also possible options of Finsbury Park and Moorgate, may have forgotten some.
We had to rule out St Albans, Tring, Berkhamsted and Harpenden as we just couldn't afford anything there.
We found places like Hemel Hempsted, Watford and Stevenage were cheaper but we liked the idea of being in a market town or a garden city.
Hitchin is lovely but housing expensive if you want to be within walking distance of the station. School admissions came across as being quite frenetic - houses in certain catchments attracting a premium, etc.
Letchworth is cheaper and bigger.
Baldock is smaller with a very pretty centre dominated by one of the largest Tescos I've ever seen...
Knebworth is more of a village but good rail links. My friend lives there and loves it.
Bishops Stortford is cheaper than Hitchin and has more varied housing stock, including older properties. You could also look at Broxbourne, which is closer to London than BS.
Think about schools. Hitchin and BS have excellent secondaries but some are single sex and some of the non-selective mixed schools are religious and/or don't have such a strong academic reputation. You may have a view on that.
Oh, and bear in mind that to get to the station, you will have to walk, cycle or drive, and the latter will add at least £1000 for parking onto your commuting costs. Which will be high. Potentially around £5k per person per year. So be really realistic about how much time and money you're willing to spend commuting and how far you're willing to be from the station (think about walking it on a cold wet night...). DP blithely insisted a half hour walk with no bus service would be fine. No, DP. Come on.