Filter advice for a 65L/15G & Removal of UGF system

I brought a tank 4 months ago 'my first tank'.
It come with an Under Gravel filter at the time I didn't know it was a bad thing.
Now I'm having problems with phosphate which I've been told is from a build up of gunk under the plates.
My LFS have recommended me to change my filter system.
I don't really want to get a external hang on filter I don't like the look of them, and a full external encased jobby might be a little over the top for my 65L.
So I'm thinking of an internal filter, anyone have any recommendations or tips or is this even a good filter type to use.

Also any advice to removing an UGF would be fantastic. I'm a little worried that while removing the UGF it might mess with my Ammonia/Nitrite/Nitrate which at the moment is 0/0/20. Will it cause a mini cycle? I won't remove any gravel just vaccum under the plates before removing them.

Thanks for any advice

J double R said:

well, if youre willing to completely upset the biological filtration and muck up your water for a while (i wouldnt do this unless you were doing a fishless cycle) you could convert to a RUGF and have a HOB.

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A HOB? Hang on Back. Could I use an internal one rather than a HOB.
I thought about turning it into an RUGF would that get the muck out or do I still need to clean under the plates?

I have 2 plates to my UGF maybe I could remove them one at a time a few weeks apart to allow my biological filtration system to settle back down before removing the other plate.

By switching it to RUGF will it force all the muck out with the assistance of a good vaccum.
All the muck is causing a really high phosphate level and I need it out.

I picked up this filter today - Eheim 2010 http://www.eheimasiapacific.com/English/pickup.htm
I'm going to run it with the UGF for for a few weeks like rbishop recommended. I'm just a little unsure if I should change it to RUGF right now or just leave it for a few weeks before changing over to RUGF.