VPS or Managed WordPress solutions?

[wwwspyder]

I run 4 WordPress sites. Some are more complex than others (1 is moderately intensive).
I'd like to host all my sites on the same platform, rather than have 1 here, 1 there, etc. I can spend up to $25 a month on hosting. So a few questions:
1) Are there any VPS hosting with good support?
2) Should I look at Managed WordPress solutions? Any recommendations?
I am looking to upgrade to something more WordPress friendly. (currently paying about $15/month).
What can you say about Greenwebpage.com website hosting solutions? Can I rely on them? What host is better?

Thanks!

[Vanhoeck]

Try reliable services from hostingsource.com or libertyvps.net as they are proven to be the best in delivering their services in a webmaster-friendly manner.

[Corrsikos]

Give Exmasters.com vps hosting a try. The server uptime and overall speed performance are outstanding and consistent.
When signing up with such a cheap provider, I was initially concerned about reliability and customer service, but both have been excellent.

[Finelige]

Get VPS - $5 first month for any plan: https://hostingsource.com/vps-hosting-promo/

[Rizzotto]

Take a look at Kvchosting.net SSD VPS plans. My site has never encountered slow-down nor has it ever been offline without explanation.
This decent host also offers excellent value for money with a lot of great features for what I consider a very reasonable price.