Any suggestions for an easy chilli to grow on a windowsill?

This year I am growing a few types of Chilli, with mixed results. I am pollinating with a little brush as they are on my windowsill but am a bit disappointed with the results so far.
Golden Ceyene - about 6 decent sized chillis so far from one plant
Jalapeno - two plants - about 6 fruits in total
Big jim - two fairly large plants - no fruits - just lots of flowers that keep falling off
Habanero - tiny plant - no flowers or fruits.

Next year I am looking to grow chillis again, does anyone have some suggestions of really reliable types. They can be anything from medium to mental hot. Also could I just keep the existing plants going and get a head start next year?

I have a Pretty in Purple chilli which I kept over winter on my kitchen window ledge

They don't get very tall and are covered with little pink flowers and then purple to red small chillies. They are only just beginning to show set, so I think you are asking for too much too soon.
Patience is required and some more warm weather wouldn't go amiss either

Jalapeno are always reliable,so dont panic just yet and besides,you wont have any chilli plant ready to use for months yet. I'd say you are looking at the backend of August and right through September for your results. 'Fresno', 'Hungarian Hot Wax', 'Apache' and 'Rokita' are all reliable chilli seeds. Hope I have been of some help. PS; There is one chilli plant grown from seed that will blow you away,it is called 'Bhut Jolokia', there are various strains and I believe some are used in certain restraunts in curries and other 'hot dishes' and you are asked to sign a disclaimer before they will allow you to eat them! I kid you not.

You can overwrinter the habs and you'll get a better crop next year. The others you really need to start early Jan. All plants are a little on the large side for a window sill, Im surprised you have fruit already Id have said you're at least 6 weeks ahead of me.

You could try Apache or Superchilli  both have been bred for pots in a window and will give you plenty of standard supermarket style peppers - I have to say I find them rather boring though.

Thanks for the replies I am slightly relived by people saying I should not be expecting much yet. I was interested in the idea of planting chillis in the summer to fruit next year - anyone else done this?