There's something I've been wandering about a House/Home Mod. If I download a house mod, Will I be able to send my Spouse & Housecarl to my new home? Also another question while I'm asking about houses, is there any way to have both of my Housecarls in the same house or only 1 at a time? I ask because Lydia is stuck at DragonsReach as I haven't bought Breezehome & Don't plan on buying it.

By default, no, custom homes don't count as homes that spouses or housecarls will know to return to. There are a number of mods however to do it though. I think I'm using like three mods that all let you do something to that effect:
- Ultimate Follower Overhaul: http://skyrim.nexusmods.com/mods/14037
Has a "relax" option that essentially puts them on an idling standby. Not entirely the same as a home, but they'll interact with nearby objects like sitting in chairs (eating, drinking, reading, etc.) or using crafting stations.
- Spouses Can Live Everywhere: http://skyrim.nexusmods.com/mods/11370
You get a spell that sets the current location as "home." I haven't really messed with this much since it's sadly only limited to spouses, it does nothing for other companions.
- My Home Is Your Home: http://skyrim.nexusmods.com/mods/18045
This lets you set any followers home location through a dialogue option. They'll return to the location you set, and roam about it like they would a regular home. How far depends on how big the home is and where you told them their home was.

Using either/both UFO/MHIYH you can set followers to stay in the same location. I had 5 followers staying in my custom home in my last game.

Thank you very much for the links, I'm currently using Honeyside Home. But I'm looking for a new home at least until Hearthfire comes out for PC.

I've been using Riverside Lodge: http://skyrim.nexusmods.com/mods/14308

Tried a few other mods out, but it just consolidates things too well to replace it. Autosorting containers are a big plus too. Ceilings could be higher, but oh well.

Thanks for the link to that House looks really nice from the pics & vid. Just installed it, time to see it in game.