Ally, I understand everyone has different needs. But I just want to point out that you will be the one to gain the most from giving DS a day/half day in daycare. Again I am not intending to offend here I honestly hope I don't. But the fact that DS is already enjoying Kindy gym & isn't showing any interest in the other kids while there, is probably a good indication of what it will be like at daycare. Evan & Glenn also love playing with their cousins when we do see them. Funny how they are drawn to the older ones too isn't it?!
I think Evan was the same age as your DS when I thought he must be missing out on something by not attending daycare. But it was the daycare director that I spoke with who said, I don't need "day care" for him to be looked after while I work etc, I wasn't keen on the idea of putting him into daycare & that at his age he really didn't need the interaction with other kids. That their world is centred around them selves.
It sounds as though we are similar in that I too have very rarely had my kids baby sat. I think I could cound maybe 4 times in the 4 years I have had kids. 2 trips to the movies & once when I had to work & DH wasn't going to be home till after 2 hours after I had left. I think there was a 4th but I am not 100% as I can't remember what it was for. Oh unless you count the hour or 2 my mum sat with Evan while DH was with me during the birth of Glenn.

Even though I can understand that everyone is differnt, kids included. I still believe that kids under 2 don't "need" daycare interaction with other kids. But sayign that, I will say that Kids need a happy & loving home environment (& please don't take this the wrong way) But I think that if you feel that the 1/2 day/full day in daycare will help you be a better mum to your little man. then I think thats ok. I too (I am sure we all) need that time to ourselves. I am not ready for Glenn to go to preschool, he loves coming onthe 1 day I drop Evan off & pick him up & would probably be fine if I left him but I would rather wait till he is 3 like Evan was. So on the one day Evan is at preschool I still have Glenn undertoe. But I get my time to myself once they are tucked away in bed. Thats all I need most days is just an hour to myself to unwind (usually on here lol).
But I don't think its selfish to need more time to yourself & if daycare is the answer for you then so be it.

Please Please please don't take anyof that the wrong way. If it came out the wrong way please just disregard it as I honestly don't mean any offense.