External Canister vs Internal Power filter

Hi all

I realize this topic might have been flogged to death, but I am seeking
advice. I currently have a few Malawi's housed in a 243l tank with a 60l
sump and it's associated bio media. Due to space constaints I would like to
reduce this to a 184l tank (36"x18"x18") - with no sump My question is
this - which is better, external canister vs internal power filter.

I was originally considering a Fluval 204 (or possibly a 304). Eheim in
South Africa is just far too expensive. I was speaking to couple of the
local dealers, and some of them say a couple of internal power filters tend
to be better in the long run... Because a) they are quieter, b) less prone
to failure c) cheaper d) higher filtration rates for a give cost.

My feeling is to go for the canisters because a) they are easier to clean -
no hassle in digging around in the tank and b) more efficient with a larger
filter volume and space for good bio filtration, but at the price of lower
filtration rates.

Which would most people advise? Also, I like the idea of the corner surface
skimmer box which I have in my current setup. Can this be duplicated with a
canister - although I see the risk of the filter running dry if water levels
drop due to smoe problem.

Thanks in advance
Simon