Should I move to a VPS??

I have a few autoblogs on a shared hosting plan at Startlogic.
One of them now has over 20,000 posts, 275,000 comments and gets around 2000 UV's per day.

I have noticed that sometimes the blogs are not accessible. When I try to open the site or the Wordpress admin page I get a 500 server error. At other times it seems very slow to load as well. It usually come right by itself but I am thinking it is outgrowing it's shared hosting.

Would moving up to a VPS plan be a good idea and if so should I stick with Startlogic or move to another host? I have heard people mention Hostgator on here quite a bit. Startlogic have a basic VPS plan for $29.00 a month. (One of my blogs is making arond $15.00 a day so I guess the cost is not a problem)

This is the details of the Startlogic plan

Host Unlimited Domains
20 GB Disk Space
1 TB Transfer
1 GB Burstable RAM
SSL/CGI-BIN
Debian / Apache
Parallels Power Panel


I dont have any experience with a VPS so just wanted to get some advice on which one to choose.

Also, will moving to another host affect my rankings in the serps at all?

yes you are over killing your shared host, better move to a VPS or a dedi if costs permit. You can go for managed if you are not too savvy about hosting and stuff.